Reddit mentions: The best water softeners
We found 43 Reddit comments discussing the best water softeners. We ran sentiment analysis on each of these comments to determine how redditors feel about different products. We found 27 products and ranked them based on the amount of positive reactions they received. Here are the top 20.
1. Fleck 5600SXT 48,000 Grain Water Softener Digital SXT Metered Whole House System
- AFWFilters install kit for easy installation
- Made in the USA, AFWFilters easy to install, easy to use
- The Fleck 5600sxt digital metered, on demand valve. The newest 5600 model with fully programmable cycles
- Fleck 5600SXT Digital Control Head with bypass valve and 1" threaded plumbing adapter (yoke)
- 10" x 54" tank, 15” x 34” brine tank with safety float system, (color may vary)
Features:
Specs:
Color | Black |
Height | 62 Inches |
Length | 27 Inches |
Width | 17 Inches |
Size | 48,000 Grains |
Number of items | 1 |
2. WaterWorker HT-2B Water Worker Vertical Pre-Charged Well Tank, 20 Gal, 3/4 In Mnpt, 100 Psi, Steel, 2-Gallon
Designed to meet the requirements of, and are listed by the National Sanitation Foundation (NSF) under ANSI/NSF Std 61The Butyl diaphragm has seamless construction and is designed to flex rather than stretch and crease like bladder tanksThe polypropylene liner for the water reservoir will not flake,...
Specs:
Color | Blue |
Height | 8.3 Inches |
Length | 13.7 Inches |
Weight | 5 Pounds |
Width | 8.4 Inches |
Size | 2 Gallon |
Number of items | 1 |
3. Aquasana Whole House Water Filter System - Filters Sediment & 97% Of Chlorine - Carbon & KDF Home Water Filtration - EQ-1000, 10 Yr, 1 Million Gl
- Clean, Great Tasting Water From Every Tap In Your Home - Removes 97% of chlorine and reduces harmful contaminants like lead, mercury, herbicides, pesticides, VOCs ,and more. The Rhino 1,000,000 Gallons' newly-improved divider valve enables flow rate up to 11.8 gallons per minute with no noticeable change in water pressure.
- High-Performance Filter System - Carbon & KDF filtration media engineered to maximize contaminant reduction while leaving healthy minerals in your water. This system will NOT reduce Total Dissolved Solids (TDS)
- Cost Efficient & Long Lasting - Clean water for less than $0. 01 a gallon - Save twice as much compared to other brands on purified water for 1 million gallons or 10 years
- Easy Maintenance - No draining or back flushing needed - Easily replace pre and post filters every 2 months for best filtration and flow rate
- Top-Grade Install Kit & Components - System includes filter tank, 20" pre-filter, post-filter, brass fittings for 1'' or 3/4'' pipes, bend supports, and shut-off valves – Item may ship in more than one box and may arrive separately
Features:
Specs:
Color | Blue |
Height | 44 Inches |
Length | 9 Inches |
Weight | 58.92 Pounds |
Width | 46 Inches |
Size | 10 Yr, 1 Million Gl |
Number of items | 1 |
4. Aquatabs AQT100 Water Purification Tablets (Pack of 100)
Trusted for over 20 years for use in emergency situationsHurricanes - tornados - earthquakes - floodsOver 3 billion gallons of water treated annuallyFast acting. Water is ready to drink 30 minutes after mixingNot unpleasant taste. Great tasting water consistently
5. AFWFilters 5600SXT Water Softener, 48k, Black, Bypass with 3/4" Connection
HIgh Capacity long life 8 percent crosslink resinDurable paddlewheel meterMetered regeneration works on demandInstallation instructions and video guidesAdjustable cycle times are available in programming section
Specs:
Color | Black |
Height | 0 Inches |
Length | 0 Inches |
Weight | 150 Pounds |
Width | 0 Inches |
Size | 48k |
Number of items | 1 |
6. Fleck 5600sxt Metered On-demand 48,000 Grain Water Softener with brine tank, bypass and 1" adapters
Engineered with double backwash
Specs:
Color | Black |
Size | 48,000 Grains |
Number of items | 1 |
7. Nikken Magna-Charger Water Mineral Buildup Reductor
- Not A Normal Glue,Much Stronger Than Any Other Glue Guaranteed, Fix Other Glue Cannot and You Can Even Build Up Material with It, and That Material is Structually Strong. Magical for Small Parts that Demand Great Strength
- Repair Almost Anything: Plastic,Glass,Wood,Metal,Fabric,Stainless Steel, PVC,ABS,Acrylic,Ceramic And More. From the Precious Jewelry to Multiple Craft Projects with the Lowest Cost
- Creates a Permanent Bond In 5-10 Seconds With the Prep Pad Clean The Bonding Face And Cure&Shape Under The UV Light. The UV Curing is Very Fast and Makes Precarious Repairs Possible Without Difficult Clips and Jigs to Hold a Complex Joint While Glue Dires
- Safe,Non-hazardous Formula,Water Proof and Heat Resistant. Used Advanced Technology, It is also Environmental Safe and Passed the EU 174 Project Testing
- Kit Includes: (1) 1 Glue Pen + (2) Alcohol Prep Pad+(1)UV Light With Battery. Please Follow the Instruction on the Backside and Contact Us If Any Question
Features:
Specs:
8. (Package Of 2) Pro Products RK41N Pro Res Care Resin Cleaning Solution (1 Bot...
- 2 GALLONS PRO RES CARE RESIN CLEANING SOLUTION
- Cleans fouled Resin and restores capacity
- Maintains Performance of softeners
- Restores efficiciency with Pro Res Care Resin Cleaning Solution
Features:
9. DURAWATER Fleck 5600 SXT Iron Pro 48,000 Grain Water Softener Ships Pre Loaded with Resin In MIn Tank for Easy Insatllation
Water softener, iron filter, all in one48, 000 Grain Capacity, fine mesh resin designed for high iron removal & long lifeFleck 5600Sxt digital metered valve for efficiency and ease of use, 5 year warrantyRemoves all hardness, iron up to 6-8 ppm range, manganese up to 6 ppm, sediment, sand, rustSized...
Specs:
Color | black or almond |
Height | 10 Inches |
Length | 54 Inches |
Weight | 99 Pounds |
Width | 10 Inches |
Size | 48k |
Number of items | 1 |
10. Santevia Water Systems Mineral Stones
Filter life: mineral stones: 2-3 yearsRaises pH about 1. 5 to 2. 0 unitsRelease easily absorbed, ionized minerals into the waterCalcium, iron, magnesium, potassium, zinc and other trace mineralsBoil every 6 months to clean
Specs:
Color | Brown |
Height | 6 Inches |
Length | 1.4 Inches |
Weight | 1 Pounds |
Width | 4.5 Inches |
Size | 1 Count (Pack of 1) |
Number of items | 1 |
11. Oatey 35206 Hercules Boiler and Heating System Cleaner, 1-Quart
The product is manufactured in ChinaThe product is highly durable and easy to useEasy installation and easy handlingLiquid cleaner and corrosion preventative treatmentHelps maximize boiler efficiencyContains silicone which protects pumps by lubricating sealsHelps stop priming and foaming with a spec...
Specs:
Color | Yellow |
Height | 9.25 Inches |
Length | 4 Inches |
Weight | 2.3 Pounds |
Width | 2.25 Inches |
Number of items | 1 |
12. Megahome Water Distiller, White Enamel, Plastic Collection
- One-year Warranty / 30-day Money back guarantee.
- Up to 4 gallons per day output.
- Safety Shut-Off, UL approved, BPA free.
- Best Rated Distiller on Amazon.
- True Steam Distillation System
Features:
Specs:
Color | White |
13. Ascaso In Tank Rechargeable Water Softener/Particle Filter for Espresso Machines - 24 L (D107)
- Resins are rechargeable for up to one year (recommended to recharge at least once or twice a month with salt OR every 24 liters of water)
- Can be used in all pump model espresso machines that have a water intake tube in the espresso machine's water tank (this cannot be used in espresso machines with direct water/plumbed in connections or where there is a bottom feed of water from the reservoir)
- Depending on your monitor, the resins may look lighter or darker than what they really are.
Features:
Specs:
Color | Clear |
Weight | 1.3 ounces |
Size | 24 L |
14. AFWFilters FP-13244 Brass Brine Fitting BLFC 5600 Water Softener Valve (Fleck Part 13244)
- Brass 3/8" Brine Fitting (B.L.F.C. ) used on Fleck 5000, 5600, and 9000 valves. Includes O-ring (part #12977).
- BLFC Button ( 0.25, 0.50 or 1.0 gpm ) and BLFC Retainer sold separately.
Features:
Specs:
Color | Brass |
Height | 1 Inches |
Length | 1 Inches |
Width | 1 Inches |
Number of items | 1 |
15. ScaleBlaster SB-175 Water Conditioning System
For use on mid-size to larger homesWater conditioner solves hard water problems without the need of chemicals, salt or maintenanceVery hard water area (10-19 grains)Small enclosure requires minimal space for installationIndoor or outdoor use
Specs:
Height | 3.75 Inches |
Length | 10.5 Inches |
Weight | 6 Pounds |
Width | 7.3 Inches |
Number of items | 1 |
16. Water2Buy W2B200 Efficient Meter Water Softener for 1-4 People – Home Filtration & Limescale Removal System
The W2B200 provides complete limescale-free water for a family of 1 - 4 and can generate approximately 1,250 litres of filtered soft water every day. It is engineered for both city and well water. This softener is equipped with an efficient digital meter control so it consumes less salt and water.Th...
Specs:
Height | 25.590551155 Inches |
Length | 16.535433054 Inches |
Weight | 62.83 Pounds |
Width | 8.661417314 Inches |
17. Clearwave 46100000 Field CW-125, WHITE
- Remove scale build-up due to hard waterworks on both hot and cold water systems Makes it easier to wipe clean ceramic, plastic, glass, and metal surfaces Scaly crust or stains in toilets or under faucets will be significantly reduced
- Brand name: Clearwave
- Model number: CW-125
- Country of Origin: China
Features:
Specs:
Color | White |
Height | 12 Inches |
Length | 14 Inches |
Weight | 2.6 Pounds |
Width | 4 Inches |
Number of items | 1 |
18. iSpring ED2000 Whole House Electronic Descaler Water Conditioner, Alternative Water Softener
Solves hard water problems without the need for chemicals, salt, or maintenance, while keeping healthy minerals in the water by preventing scale deposits from forming and allowing existing scale to break down.Descales your entire water system and prevents scale buildup in pipes. Reduces energy consu...
Specs:
Color | Multicolor |
Height | 2 Inches |
Length | 7 Inches |
Weight | 2 Pounds |
Width | 3.5 Inches |
Number of items | 1 |
19. Eddy Electronic Water Descaler - Water Softener Alternative
- No salt alternative to a water softener. Emulates softened water without changing your water hardness. Retains healthy minerals in your water supply.
- Made in BRITAIN. 12 month 100% "no quibble" Money-Back Guarantee + Lifetime Repair or Replace warranty.
- Easy customer installation on metal or plastic pipes. Helps prevent build-up of lime scale and dissolve existing deposits.
- Descales entire water system. Maintenance-free with great results up to and above 20 gpg.
- Environmentally friendly. No salt added to your water and users report great improvements to hair and skin. Please scroll down page to see full Product Description.
Features:
Specs:
Color | Gray |
Height | 3.5 Inches |
Length | 6.75 Inches |
Weight | 0.875 Pounds |
Width | 1.5 Inches |
20. Athena H2 Water Ionizer from AlkaViva. 7-Plate, 13-Stage Dual Filter Self-Cleaning. Limited by AlkaViva
- water ionizer acidic basic
Features:
Specs:
Height | 12 Inches |
Length | 18 Inches |
Width | 14 Inches |
🎓 Reddit experts on water softeners
The comments and opinions expressed on this page are written exclusively by redditors. To provide you with the most relevant data, we sourced opinions from the most knowledgeable Reddit users based the total number of upvotes and downvotes received across comments on subreddits where water softeners are discussed. For your reference and for the sake of transparency, here are the specialists whose opinions mattered the most in our ranking.
I actually didn't tally up the cost as that wasn't really of a concern to me, but I'll try my best to provide links to the things I bought for this. Feel free to add it up for me!
I also bought various tools, like crimpers, Dremel kit, drill, etc, but I don't consider those to be project-specific as I'll have them for the foreseeable future. Let me know if there's anything you see that you think I missed!
Yeah, I'm thinking the furnace is probably a no-brainer. Not sure about unexpected costs that might spring up along the way, or if I'm being unreasonable in expecting it to cost in that range; probably the best answer is to get an estimate so I know.
The filtration system (like this) I'm also unsure about whether it could be reused, and that's a big part of the question. If anybody knows which of these might be reusable for new construction I'd appreciate the insight.
Insulation, like the furnace, is what makes these questions so gray. The timeline is right on the edge between making these things obvious money-saving things or being worth that many years of comfort and being a frivolous waste of time when we could be spending the money on the new house.
> Savings tip: calculate your spendings in reflection to your savings/month. let's say you can save 500,- a month towards the new house; an expense of 6k now adds a year to your expected moving day.
This is a great way of looking at it. Thanks for that.
You look to have really good well water. Low iron is always a plus. I have one of these, works great.
Fleck 5600SXT 48,000 Grain Water Softener Digital SXT Metered Whole House System https://www.amazon.com/dp/B00OGN3162/ref=cm_sw_r_cp_apa_i_oQkuDb0VQ1ATM
Adding a filter before for sediment will help work the softener lasting longer. I have some spin down filters (you just clean the screen and reuse them) and traditional water filters that I change every couple months.
Also have this RO at the kitchen sink. Replacement filters are very reasonable, 2 sets of 3 for around $50 I think.
APEC Top Tier 5-Stage Ultra Safe Reverse Osmosis Drinking Water Filter System (ESSENCE ROES-50) https://www.amazon.com/dp/B00I0ZGOZM/ref=cm_sw_r_cp_apa_i_5SkuDbSZ9M7QN
Yup. Your well water probably has a higher mineral content than the Brita water. If you're used to the well water the filtered water tea can come across as flat. A bit surprising that it would mute such a strong taste as bergamot though.
If you have the option, you may want to look into adding some mineral content simply by tossing into the bottom of the Brita pitcher a few volcanic rocks of the kind used in filters that re-mineralize the water. This is the type you need (well, minus the ceramic spheres) but you should be able to find them elsewhere cheaper: http://www.amazon.com/Santevia-Mineral-Stone-Post-Filter-Filter/dp/B003T46666/ref=sr_1_22?ie=UTF8&qid=1341956550&sr=8-22&keywords=santevia+water.
BTW: I have a Santevia system despite having excellent Pacific Northwest mountain range tap water, and it does wonders to improve quite a few of my teas. Expensive, but worthwhile if you really want better water for your tea.
I think there are a couple of questions you should ask yourself first.
If you are using the Sawyer Squeeze, you could use something like 3L CNOC bags (the thread on top matches the Squeeze, unlike other bags), and the 3L CNOC bag is 3.7oz each ($23 https://www.amazon.com/Cnoc-Outdoors-Vecto-Container-Orange/dp/B07F1BBWHC). Good lightweight construction. If you plan to use Aquatabs, Aquamira, or bleach, you could use something even more lightweight like the Platypus 2L bags at 1.3oz each ($9 https://www.amazon.com/Platypus-2-Liter-Ultralight-Collapsible-Bottle/dp/B000J2KEGY/). Those do not match the Squeeze threads, but if you're not using Squeeze anyway it wouldn't matter. Both the CNOC and Platypus bags roll down to nothing when empty, and are easy to travel with. You could carry 2 of the CNOC or Platypus bags + 2 1L Smartwater bottles (again, the threading on these matches Sawyer Squeeze) for a total of 6-8oz, without using that much space, and without costing that much money. Just remember that water itself is pretty heavy, which is why most people try to camel up and drink a lot at water stops, and then not have to carry as much all day.
Get a real hardness test first. Money well spent.
Hach 145300 Total Hardness Test Kit, Model 5-B https://www.amazon.com/dp/B008FM7WLU/
Then get a water softener. Put it after your filters. They are easy to install if you have done any plumbing work. I got this one, it’s great (edit: size your water softener based on your hardness test! I had 19 grains hardness. You want to run a week between regen, give or take, with a 20% buffer. 19 grains x 4 people x 75 gallons per day x 7 days x 1.20 buffer is 47,880. I got a 48,000 grain softener):
Metered water softener with 3/4" Fleck 5600SXT control, 48,000 grain capacity with by-pass valve https://www.amazon.com/dp/B000GBZ2P6/
My water was quite hard, around 19 grains. The softener fixed that, but made it taste like mud.
So I got an RO system and plumbed it to my fridge only. That was easy too. Took me a couple hours total.
I got this one:
iSpring RCC7 High Capacity Under Sink 5-Stage Reverse Osmosis Drinking Water Filtration System and Ultimate Water Softener- WQA Gold Seal Certified https://www.amazon.com/dp/B003XELTTG/
It’s been a trouble free year now with great tasting water. The showers are a bit slipprier, yes, but my kids are less itchy, and gross shit doesn’t grow over every water source in my house any more. Worth it.
I have a Kinetico Sulfurguard system with Fleck water softener. The water softener I bought on Amazon and installed myself which is very easy. Kinetico only sells and services through their dealers. My drinking water is better than the city or county. This is the best setup Ive found.
https://www.kinetico.com/specialty-solutions/sulfur-guard-backwashing-filter/
https://www.amazon.com/dp/B00OGN3162/ref=cm_sw_r_cp_apa_i_uGqCDbP3RQG4Z
Edit,...the kinetico is a hydrogen peroxide system
I'm in the desert so can't say anything to colder climates. Typically they break down due to scale buildup which can be remedied with a descaler, ie something like this at the input line. Like with anything follow the reviews. There should be a unit that works for your climate and the number of people in your house. If you only run one shower at a time then a big tank seems overkill, to me anyway, and some of these units can provide enough for two showers and two sinks at the same time.
However, living in MN definitely drops a wrench in the idea. You may just be better off sticking with a tank.
It's a Nikken Magna-Charger
>The Nikken Magna-Charger has powerful neodymium and ferrite magnets that reduce mineral clumping, acting as a natural water softener without adding chemicals or salt. It decreases buildup inside pipes and may help prolong plumbing life
Looks like they sold for roughly $150
I’ve heard the crystals are best. There are also pellets and the big blocks. I use the crystals and then once a month I put in resin cleaner.
(Package Of 2) Pro Products RK41N Pro Res Care Resin Cleaning Solution (1 Bot... https://www.amazon.com/dp/B00FKFMVVG/ref=cm_sw_r_cp_tai_5KcYCb7K2DP88
You need to open an air purge valve (I am assuming you have one or more of them) to allow the water to drain out.
The reason that it may be gunky is that it has not been cleaned, nor has had an anti-corrosion additive used.
https://www.amazon.com/Oatey-35206-Hercules-Heating-Cleaner/dp/B000BVOTD2
https://www.amazon.com/Rectorseal-68712-Quart-Boiler-Treatment/dp/B008A3UEA0
With boilers, a clean system is a happy system. If you take care of this now, and drain and maintain it on a regular schedule, you should get many years of great service out of it.
It is when they get neglected that things can go to shit.
It sounds like you need a softener. The fleck ones are popular. A softener would help with the problems you described. https://www.amazon.com/gp/aw/d/B00OGN3162/
You should test again though and confirm.
The first thing you posted is basically 2 big blues but way more money. https://www.amazon.com/gp/aw/d/B0014C3IOS/
Both things you posted are housings. The second one is basically a single housing that has multiple filters where as the first one is 2 housings which would each have a filter each. Most likely 1 particulate, 1 carbon. They would both more or less do the same thing
That being said it sounds like you need the softener not the filter.
You're not going to find a small RO filter. You're better off with a small distillation unit like this one.
Why don't you want a regular RO filter? I have one that fits nicely under my sink.
It seems like some de-ionization resins are rechargable (ex: this one) by putting them in a salt water bath occasionally (weekly?). They dont last forever but you might get a year out of it. I think something like this plus using brita filtered water should prevent the vast majority of scale from accumulating.
check my edits that I was making probably while you were replying. If the filter is hanging off there as well, then you most likely have all the parts screwed onto to that connection awaiting your use. You just need to unscrew them, assemble them in order on your tubing as I described (adding in the filter in between where shown int he diagram).
I just caught you that you said you don't have that male union. If that is truly the case, this is a special part called a BLFC (Brine Line Flow Control). Appears just like a union, but has a special insert for Flow Control. You can get BLFC for the more common Fleck control valves, but you need to contact your supplier as the insert is specific for your filter.
​
EDIT: appears Hankcraft duplicated the design of a Flek 5600, and the parts are interchangeable. If so, here is your part that you said you are missing:
https://www.amazon.com/AFWFilters-FP-13244-Brine-Fitting-Softener/dp/B07NJCFNTB
source of claim parts are 90% interchangeable:
https://www.softenerparts.com/kb_results.asp?ID=231
http://www.amazon.com/Fleck-5600SXT-softener-digitial-metered/dp/B004GEFKN8
That exact setup, but I got it from another website for a little less and I got to choose the resin tanka and brine thank size. I don't remember the website though
Scam
I looked at the product and immediately thought scam...ten I saw that there were over 200 reviews and most were positive and then I thought "Could it really work?"
I read the reviews. All of the positive ones were very well written, they were very specific (ex purchased on February 12, 2017 or my gpg is 197) and most contained photos...hmmm.
The reviews on Amazon are VERY different from the HD reviews https://www.amazon.com/ScaleBlaster-SB-175-Water-Conditioning-System/dp/B0089FLDWM
Scam 100%
Not opposed to working with a licensed plumber, though I’ve never found one that shares my attention to detail and I’m fairly confident I can do the copper work with SharkBites.
Ranch house built in 1948, warm climate. Mostly ½” copper.
Currently the copper main comes in, then a previous owner fitted around 100ft (!) of PVC tubing into a water softener clear on the other side of the basement area. I don’t have any pressure problems, but it’s a sloppy mess of unnecessary PVC so it’s going away.
I’ll start with cutting off the copper-PVC fitting and run a new span of copper to the accessible area of the basement. Then an elbow, then a SharkBite cutoff ball valve, then a leakSMART automatic cutoff valve (link below), then an Eddy water descaler (link below) wrapped around copper line, then back to the rest of the system.
Suggestions welcome!
Automatic Shut-Off Valve by leakSMART includes 1" Automatic Water Shut-Off Valve (Only)
https://www.amazon.com/dp/B071YHRXG4/ref=cm_sw_r_cp_tai_mX02DbHG1YBFR
Eddy Electronic Water Descaler - Water Softener Alternative
https://www.amazon.com/dp/B003Z96GR4/ref=cm_sw_r_cp_tai_LY02DbB9T7PAY
Like this one? https://www.amazon.es/Descalcificador-descalcificadores-Water2Buy-Elimina-derivaci%C3%B3n/dp/B009SOYMTE/ref=sr_1_1?ie=UTF8&qid=1502895019&sr=8-1&keywords=water+softener
Do you recommend one other then this Fleck? https://www.amazon.com/Fleck-5600SXT-Softener-Digital-Metered/dp/B004GEFKN8/ref=sr_1_4?s=kitchen-bath&ie=UTF8&qid=1478113584&sr=1-4&keywords=water+softener
>I’ll just say I don’t think determining if something works or not can be measured by whether or not builders include them in new constructions.
If they worked, why wouldn't they be used in place of real water softeners that use the well-established chemistry of ion exchange.
After all, these electronic gizmos are cheaper, easier to install, and have no routine maintenance required.
When they first hit the market ~20 years ago, they were called "electronic water softeners". The FTC came down on that term, so they've rebranded themselves as "electronic water conditioners" or "electronic water descalers". The revised claim is that they change the "shape" of magnesium/calcium salts so they won't bind surfaces.
My house came with one (installed by the previous owner). I left it running till it died about 2 years ago. When it died, I looked into replacing it, but didn't follow through. And surprise, surprise - there's zero difference in how my dishes dry, or the scale in fixtures. So, it's big fucking placebo effect.
P.S. This is the one my house came with:
https://www.amazon.com/Clearwave-46100000-Field-CW-125-WHITE/dp/B00795B9IQ
has anyone used some like this?
it seems doable for the price and how easy it looks to install. im skeptical, but i also understand I have a hard time grasping electrical knowledge.
I'm thinking of this one from Fleck. Any big differences between it and what I have now?
Fleck
https://www.amazon.com/gp/aw/d/B004GEFKN8?vs=1
Kenmore
http://m.sears.com/kenmore-extra-high-efficiency-water-softener/p-04238350000P
Also, since I already ordered the unit (which is obviously bulky), could I just replace the valve and not the tank?
I ordered the Fleck 56000SXT 48,000 grain
Reminds me of this thing
https://www.amazon.com/dp/B01JEYL7AO
This is only $200, can be installed by anyone, and will stop calcium and lime from depositing on your pipes or appliances. It won't help with rust but that doesn't look to be a problem for OP.