I have a Pentair Clean and Clear 420 filter. I'm trying to clear my pool of a build up of fine silt, and this is just blowing through the filter as I vacuum from the pool. In the parts diagram, there is a part called the lower manifold, ie part number 8. It has a pvc pipe rising vertically to the top of the filter assembly, and it has a cap of some kind at the top. The cap has deteriorated and is broken. I'm not sure exactly how the filter works, but I suspect this may be where I'm getting some bypass of the filters. I may also need to replace the filters, but I want to look into this broken cap first.
Can anyone explain the purpose of this vertical pipe and the cap at the top?
Can anyone explain the purpose of this vertical pipe and the cap at the top?