My pond is 7,000 gallons. I have a 4,000 gallon pump from the bottom and a homemade surface skimmer with a 900 gph pump. So I used the 900gph to run through the protein skimmer from the surface skimmer. I have 2 air pumps running. One in the pond and one in the open style filter(green machine copy..but 275gallons). So I put that air pump to run through the protein skimmer with 6 airstones. . The skimmer sits in the open filter. the outflow water exits under water, and the foam exits about 1-2 inches above the water surface in the open filter. It has been taking out 1-2 gal per day of dark brown liquid. I could adjust it for a more dry foam..but who cares? Let it take 2+gallon per day...no big deal. water has gotten so clear with this addition. Very happy!!!
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