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Message: [QUOTE="koiguy1969, post: 115154, member: 1264"] i have a Tetrapond 9 watt U.V and it should handle clearing your ponds volume in a few days..no problem. 1900 gph is maximum flow rate for your U.V but i think its way to much...you want to give the water flowing the U.V sufficient exposure time...1000 gph thru the U.V seems to be a real good flo rate. i used to have a 450 gal pond that i used it on, and with a 1000 gph pump...used the same setup with my 1200gph pond...cleared either one in just a few days...500 - 700 gph is likely an optimum level in a smaller pond like yours. but like i said 1000 gph is what i used, had great results, with the same U.V.... good luck. [/QUOTE]