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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?
Side note: If this topic has been posted elsewhere or if anyone knows where I can find more information on this topic it would be greatly appreciated. Any reply is awesome. I'm curious and have had no luck finding this bit of information.
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.