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Message: [QUOTE="GBBUDD, post: 522572, member: 10026"] The 750 was 3000 gph it's a little over double in gph at 6600 but add high head to that equation and it does not loose pressure as fast a low head pressure pump or standard usually fades to no water pressure water 10 to 15 feet of head. Meaning at 15 feet it's less than a kitchen faucet. A pump at 3000 high head say 58 feet and you will probably have 2500 gph. I remember this build well. All is not lost use the extra as circulation . I do forget the filter but I remember there was a t where the bottom drain was elevated? Or am I crossing posts. Regardless you do want to disturb the bottom of the pond blow all waste to the drain. Make the plants get nutrients from the water not the substrate. [/QUOTE]