Originally Posted by fishfreek
Sounds like a home made dorso stand pipe. The idea is that water will flow down the overflow quiter since its not sucking air plus the water level is higher in the overflow so its not splashing as much.
This is what I was thinking too, but this is making a sucking sound and is gurgling. loud too. I figure that the whole in top was to stop a syphon but the didn't make since either, because the u shape is just two pvc
90 degree elbows glued together. that shoudn't create a syphon, but might create an air pocket so water won't flow through the drain and that is why the whole is on top.
why wouldn't you want to suck out the floating material? isn't that the whole point of the filter?
I have never seen anything like this?? crazy
I am open to any ideas as to why and if I should replace it and what with?
it is there for some reason.