Well first of all u never even came close to 8000 gph because u hav e the wrong hose size.. That size pump you need to have a 3inch line to accomidate the flow of the pump. Second how did u come up 7'of head? I can give you a ton of pumps but you got to get the right size hose to start w. And some additional info is need.. What is the length of the hosing? Are there elbows? How tall is the waterfall from surface area etc..
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