Reddit mentions: The best flowmeters

lowes has globe valves.

https://www.lowes.com/pd/Mueller-Streamline-Rough-Brass-Straight-Valve/3506542

With the inconsistent pressure and less than full pipe and being limited to just 3/4" on the tank, maybe it might be a better idea to do 1/2" after the T to the vlaves.

The size of the pipe after the valves shouldn't really matter when it comes to controlling your flow.

Do you have to run the top tank? Can you just plum the pump right to your piping? That would probably help purge out all the air and make it much simpler.

The rotameters are basically flow meters.
Generally flow meters measure how much total volume goes through them regardless to time. Rotameters gives you your flow vs time like gals/min.

You can use a flowmeter and a stop watch to figure out your gals/min.

With that rotameter the flow has to be going up to push the disc up that has to overcome gravity.
You could pipe them so they are after your T going up then elbow it down.

This style is nice because it has a built in needle valve to adjust your flow. It would eliminate the need for the globe valves.

https://www.amazon.com/uxcell-Black-Adjustable-0-1-1-LZM-15/dp/B00CZ6ISSI/ref=pd_sim_328_1?_encoding=UTF8&pd_rd_i=B00CZ6ISSI&pd_rd_r=FR4ANJXTC748ZAF5T95J&pd_rd_w=svkN9&pd_rd_wg=t9Tjw&psc=1&refRID=FR4ANJXTC748ZAF5T95J

this one is popular (but not sure if it's food safe) https://www.adafruit.com/product/828

I recently had to replace it and got this https://www.amazon.com/gp/product/B07MY745M4/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 (says its food safe) didn't want to spend extra money for shipping from adafruit and wait longer then i needed to

this one seems to be the best one out there as far as quality and accuracy http://www.swissflow.com/sf800.html (on my wish list to replace the one in the middle, pricey but worth it

This one might be nice too: https://www.amazon.com/DIGITEN-Connect-0-3-10L-Effect-Sensor/dp/B01D44N41U/ref=lp_3206433011_1_8?s=industrial&ie=UTF8&qid=1564014029&sr=1-8

Better flow range (doubt you'd go more than 10 LPM) ,More accurate (=/- 2$), and while they don't state the material, it looks to be at least suitable for potable water.

Thank you a trillion!

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Link for anyone who's interested in the part

^(Apparently it's not that high quality)

Flow control valve... something like this?

Beer regulators might be okay. Some of them are limited to 15 PSI working pressure, others are maxed at 60 PSI. I'm not sure if 60 PSI is an issue because of the three diffusers and the high flow rate for three extra large tanks. Also try to get the same diffuser for each tank so that the resistance is the same.

Consider running 3/16" directly from the valve instead of reducing it later on. Fewer connections means less points of possible leaks. Metering needle valves are suggested as commonly found valves are very coarse adjustment. Consider getting flowmeters as counting bubbles will be impossible. This thread is an interesting read listing flow rates vs tank size.

Depending on how the duplex is plumbed, it could be possible to add one of these for exact usage:

https://www.amazon.com/dp/B01IZ522M0/ref=cm_sw_em_r_mt_dp_U_73kiDb98E7J1A

Is something like this an option on his supply?

DAE AS200U-75 Water Meter, 3/4" NPT Couplings, Measuring in Gallons https://www.amazon.com/dp/B06XJZSWQ2/ref=cm_sw_r_cp_api_M.uLBbDRSBZRV

That is obviously a lower end version of commercial water meters but might give you a good point of reference on initiating the scare factor into him.

This is what I use...

Western Enterprises VN Psi Test Regulator Flowmeter Nitrogen Purging 250 Pressure https://www.amazon.com/dp/B00D5R4FCY/ref=cm_sw_r_cp_apa_mIqKzbVH54A89

They are pretty cheap though. I bought a house in Firestone last year and you can get a portable explosive gas detector for inside of fifty bucks - no experience with this one but it's on Amazon for $37 they also sell one that plugs into the wall and also detects carbon monoxide

Biggest problem with the gas straight out of the well is that it has no detectable odors - after it's processed the refinery adds methyl mercaptan to make it stink like sulphur. So you would know if your natural gas line to your furnace or water heater were leaking, but without a detector you probably wouldn't know about something odorless silently seeping into your basement.

I personally have to wonder if the "problems" that were being repaired by installing a new water heater were directly caused by excess heavier gas displacing air enough to cause problems with the pilot light on the water heater.

Contains 100psi pump, 4 gallon pressure tank, analog pressure sensors before and after solenoid, flow meter, general shutoff and 3 individual shutoffs.

I'm going to connect an Arduino based board that I've built. It has an Ethernet connection to report pressure and flow data to a remote server.

EDIT: Added parts list

Storage tank: https://www.amazon.com/gp/product/B00Q798N8E/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1

Pressure relief valve 125 psi: https://www.amazon.com/gp/product/B0081TJISW/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

12V solenoid: https://www.amazon.com/gp/product/B071RYT994/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

Flow meter: https://www.amazon.com/gp/product/B01D44N41U/ref=oh_aui_detailpage_o04_s02?ie=UTF8&psc=1

Pressure gauge: https://www.amazon.com/gp/product/B0124FAV6Q/ref=od_aui_detailpages02?ie=UTF8&psc=1

Pump: https://www.amazon.com/gp/product/B017NVG1I8/ref=od_aui_detailpages02?ie=UTF8&psc=1

Analog pressure sensor 1: http://www.ebay.com/itm/G1-4-inch-5V-0-1-2-MPa-Pressure-Transducer-Sensor-Oil-Fuel-Diesel-Gas-Water-Air/321801631422?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

Analog pressure sensor 2: http://www.ebay.com/itm/Pressure-transducer-or-sender-5V-Stainless-Steel-for-Oil-Fuel-Air-Water/132258293597?ssPageName=STRK%3AMEBIDX%3AIT&var=431588849346&_trksid=p2057872.m2749.l2649