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but can anyone think of any possible causes for the symptoms I'm seeing, having started after the sand was replaced?

the orientation is correct - i did replace the top half of the valve, as the slightly worn O-ring (it is annoyingly not replaceable on its own) seemed like one obvious reason for the problem. The problem existed before that though. There is no place for a nut on that one screw (it doesn't come...

not right now.

the valve is a Pentair Body, Pentair 2" Top Mount Multiport Valve,6 Pos, Clamp-On (P/N 263085, 262525) it seems to be the one on page 840 (a few pages in) here...

Yeah, the point is that the pressure does not change ever, even as the filter gets dirty. It definitely seems (as also evidenced by the vacuum thru filter, spitting crud back into the pool, that above a certain pressure water is bypassing the sand. This also means that the good strong flow of...

I have a Pentair Tagulus TA-60D2 with 2inch pipes on the top mount filter valve. I recently had the filter sand replaced, and since then: 1. The water pressure has been low (6-7) PSI when filtering 2. The filter does do some filtering, however the PSI never increases as the filter gets dirty (it...