Wouldn't a large reservoir (50 gal) with a float valve be sufficient for any small grow regardless of r/o output? I understand if you're installing it next to your kitchen sink, but if it's a dedicated system for growing you should be fine with low flow (and regular filter changes). Or am I wrong?One word of advice dont by a cheap low flow one. yea , you think 50 GPD(gallons per day) should be fine right. Wrong. After a while all the stuff you have filtered out will slow your water production nearly in half, so i wouldn't get anything less than a 100 GPD.