Reddit mentions of Active Aqua Submersible Water Pump, 1110 GPH

PSA: The recommended pump is filled with vegetable oil. The seal will fail and coat whatever you're "cleaning" with oil that is a lot harder to remove than one would think. I was using it to wash bottles and came back to a tub filled with a cloudy, rancid smelling water. The tub still has an oil sheen in it after cleaning it numerous times, I ended up throwing the bottles out.

I now use a 1000 GPH fountain pump, it's not as powerful but it still works great.

Active Aqua Submersible Water Pump, 1000 GPH https://www.amazon.com/dp/B0049XENYS

Start with the size fish tank you want. This rearing tank is sized as a function of your stocking density and/or the amount of lettuce you'd like to grow. The tank water should be fully exchanged at least once per hour. A pump with a 2" outlet would be something akin to a pool pump and moving water at somewhere in the neighborhood of 3000 gph. A 0.5 hp pump is what's used in a full-scale UVI system. Is that how much you want to up your game? Otherwise, a small centrifugal pump like the one I use runs at about 90 W and has operated continuously for years, but I think my new system will need something twice this size.

Exactly this, and yes, it was wasteful given the expense but not too terrible and it's cutting down the time to clean all three tap lines by probably 80% (and a lot less hands on time!). I am very happy with the setup. This is the immersion pump I am using: http://www.amazon.com/gp/product/B0049XENYS?psc=1&redirect=true&ref_=oh_aui_detailpage_o04_s00 And it has a dual purpose also using it to pump water chilled with ice through my immersion chiller to get the boiled wort to lagering temp. Works great!

https://www.amazon.com/Hydrofarm-Active-Aqua-Submersible-Water/dp/B0049XENYS/ref=mp_s_a_1_2?keywords=active+aqua+water+pump&qid=1562185269&s=gateway&sprefix=active+aq&sr=8-2