Hey Guys right now I have a 850 gallon pond thats pretty sad and I want to make it around 3000 gallons. What I want to know right now is if im on the right track. For my filtration system I gonna use a ultima 2 4,000 with a 2'' head Ran on an external pump the pump will sit next to the filter and will be sucking from a bottom drain at a four foot depth in the pond. Isnt it if you add one foot of head for every ten feet youll get the amount of water that pump will pump? if so I calculated a pump that will pump about 3,200 per hour at the position it will be placed. I am also gonna use an altlantic skimmer with a 2500 gallon per hour pump that will lead to a filter fall. I have a few things im unsure of though I have clay soil were I live at about 3 feet into the ground and the drains will be at a minimum of four feet. should I did shelves for stability or should I add concrete blocks to the side Im more comfertable with the shelf part though.