the up lift is important,demands how fast it come in if you dig,any pump a do,but you want one that fill that bitch quick were you can have better control how long they sit in the water,i was gonna build a hydro with 4in pvc ,4 high to about 5ft off ground and found that i needed to double the uplift so it rushing in and receralating at same time,a standard 5ft uplift would cycle off before it would recirculate back threw,still thinking of doing it,but im doing it outside for strawberries,only way possible for me is to drill hole threw blocks and keep res inside the house,to keep it cool,triple digits here last for months,lmao,better to over power it than under power and regret it