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I receive my new compression ring for my Purex SMBW 2048 tomorrow. Do I need to run a bead of silicone on the bottom side of the tank, that sits on the rotary valve housing? Looking at how it connects, it seems like the only way to keep water from leaking.

I have an old school Purex SMBW 2048. Its sprung a leak at the bottom. Does anyone know where I can find some rebuild directions? I've removed the manifold and filters in the past, but how do I service the backflow valve? I can't get to it from inside the tank can I? Do i need to remove the...

I seem to be getting DE into my pool. There's this grey sand hanging out at the bottom of the pool. I recently cleaned the DE Filters, and when I was cleaning the Purex 2000 Filter, I noticed that the manifold was able to move around, and spin. Is this normal? Could I have a bad seal there...