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Message: [QUOTE="sissy, post: 61544, member: 2982"] good luck I did not use a weir on mine just a tank adapter for the water to come out to the waterfall with elbows and black abs piping ..Air in a pond seems to help water also that is why I have been checking ebay to find a new one .I have never used a uv because it should be connected after the filter so it does not kill good bacteria and the water has to run through the uv slow to be really effective .Tried one one time but never did anything and went back to quilt batting and lava (I know some do not like lava rock but it works for me ) [/QUOTE]