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by the sound of things it sounds a bit like the problem i am having. if you have alook at my video, you will see it. i was thinking of running a T setion about 200 mm away from the water line in the sump. i would then place a 90 bend on the T and use some more stright pipe to increase the pipe back up. i would hope this would allow the air out, and it would not be forced down into the sump.
the air return pipe would have to be moved so that it was over the sump just incase it all when wrong, then the water would just flow out the air return and into the sump. i would also place a section of foam into the pipe to baffle the sound of the overflow water hitting the sump water.
hope that helps, i am going to try it on my new set up to see if it helps.
many thanks ROB
will do a bit of autocad to get my point across
http/s68.photobucket.com/albums/i15/robs...fishtankUGJ.flv
it is about half way through, just after the point i turn on the sump return pump
rob![]()