On Fri, 14 Jan 2005 22:56:18 GMT, "Matt Levek"
wrote:

Need a little help. When I turn off my main pump the water drains into my
wet/dry filter which is more like a sump now. However sometimes the water
level is to high and it overflows. What type of valve do i want to install
in my line to prevent water draining back down through my mag pump? The
overflow is ok because once the water drops below the overflow it stops.



If it is coming down the return line you can drill a small hole in it
above the water line to break the syphon. Makes a nice ripple on top
as well. The stupid check valves will always fail at some point. The
hole can get clogged as well if it is not big enough.