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I hooked everything up and filled the tank with freshwater for a test drive. Upon turning the the return pump on in the sump the overflow pipe is sucking a lot of air. I am running a 1 inch drain pipe and a 3/4 inch return. I tried a bunch of stuff to get the drain to stop sucking so much air, including trying to fit a 3/4 inch fitting on the end of the train pipe and changing water levels. Does anyone have an idea to get it to stop? I was thinking of adding a ball valve in the drain pipe so I can adjust the flow but I don't want to waste the time if it doesn't work. Thanks in advance.
The drain pipe has a durso like tube on the top of it already and I think as long as the flow isn't too fast it functions properly. It seemed to be okay at the top when I fitted the bottom with a 3/4 inch elbow. The bottom of the drain pipe where is empties into the sump sounds like a garden hose on full blast. I found a possible solutiion on the next last night after I posted which evolves an elbow at the bottom of the drain pipe and a T-fitting off of the elbow. The idea is to have one part of the T out of the water and the other under the water. The idea is the durso can suck as much air as it wants at the top and it leaves from the top of the T rather then into the water. This hopefully will reduce noise and the amount of bubbles entering the sump. If this works I'll post a picture to share the idea for anyone having a similar problem.
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I had the problem of having to make a couple mods to my drains to get the slurping to stop. I fitted a four-way Tee at the outlet and fit a cap on the top of the Tee. I then had to drill a hole in the cap and add a 5/16" hose to act as a durso. That wasn't enough, so I drilled the durso standpipes that were installed in the overflows. They were stock, maybe 3/16" of an inch, and I opened them up to 5/16" each and then the slurping stopped. You might just need a bigger diameter standpipe.
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