You may need a larger standpipe. Also the drain should be one size smaller than the standpipe, for example if standpipe is 1.5" drain to sump should be 1.25".
Does the overflow drain line go straight down into the sump? It sometimes helps to run a section of the drain line horizontal to slow it down.
Do you have dual drains in the overflow? Or just the one? What size? It can be really hard to have both a high return flow rate and very quiet operation with a single drain setup.
Last edited by sphelps; 11-14-2008 at 03:09 AM.
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