I have heard alot of good things about the Gast pumps you mentioned in terms of reliability and durabilty. I'm trying to understand the size of pump needed per given depth of water and how that's determined. And is bigger then that actually better or does the output plateau and the rest is just overkill?
There's more to sizing a pump than just depth of water. Length of air hose and amount of diffusers count too. A larger pump will run more efficiently if it's less strained and not running to capacity. You can only get so much boil out of a diffuser, a larger pump will will not give you a larger boil. Ted at ForeverGreen (advertises here on the forum) can set you up nicely.
