I will be doing a RDWC setup, as I can no longer carry 5gal containers of soil around. There are a few things I'm having trouble figuring out, and I could use some pointers on a water cooler, water pump and just general layout. I will include as much detail as I can, and try to keep it as organized as possible. [The Basics] : 4x8' (7'tall) tent, 1600w Led (two 800W units), between 550-800CFM exhaust fan and passive intakes, going for two buckets - with two plants in each bucket for a total of 27*3= 81Gallons. Each bucket would get 4 air stones and one GH air pump. [Container]: > Still looking. Will go with the strongest container I can find. Probably two 27 Gallon containers, with two net pots in each container. And then one more 27 Gallon container for a reservoir. I was iffy if two girls will live comfortably in one 27 Gallon, but considering most people use a 5gal bucket I think it should be good? [WaterCooler]: > Before I go and spend $800 on a Water Cooler.... I don't know if I will necessarily be needing it, however if it can fit into the budget, I'm sure it will be good idea to include. It will be much better than trying to fit it into the plumbing afterwards. > I was looking at a 1/10Hp and a 1/4Hp. The price difference is not that big between the two, and so I am leaning towards the bigger on (1/4Hp) which is rated for 80gallons, and perfect for my setup size. > The two brands I'm comparing/ looking at are ActiveAqua and EcoPlus, and they seem fairly similar. > The 1/4HP Chiller is rated for a Pump Size of 264 to 660GPH. [Water Pump]: > I am really not sure how to size this. Would a 600GPH pump be good for this system? (What is considered Overkill and what is considered too small?) [Layout]: Does this layout work, or would you put the pump and cooler somewhere else? Ideally, I have the pump and cooler outside of the tent. > So I have the reservoir inside the tent, piping going out of the tent to the inline pump which connects to the water cooler, then piping from the water cooler back into the tent, and through the containers, and back into the reservoir. (like below ---> 27Gal. Reservoir ---> Inline 600GPH Water Pump ---> Input in Water Cooler ----> Output in Water Cooler ---> Piping into First 27Gal Container with two girls ---> Piping into Second 27Gal Container with two girls ---> Piping back into first 27Gal. Reservoir. ......repeat. > If I put the inline water pump then the reservoir then the water cooler, will there be enough pressure to get water from the bottom of the reservoir up to the cooler, or will I need direct pressure from the pump for that type of upward current?