I think its been discussed a lot on gardenweb.com. Google on "head height" or lift. GPH. Over there I had seen some engineers helping answer the conversion questions.
herbie the love bud Reviewed by herbie the love bud on . recirculating pump size Is there a calculation to get the correct pump size for your particular setup? I am making a hydro setup for a SOG with 70 stations. Rhizome's calculation for fan size in Noob's Growroom Setup really helped me when I was picking out my fan and could use some help with my pumps. Also...is an airstone needed with an nft system with pump on 24/7? Rating: 5