I drill it below the water line to avoid creating
microbubbles at the return outlets.

Marc

kryppy wrote:

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.




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