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Again, all was fine and running as it should for several weeks then I noticed the pump pressure elevated.

I replaced the multiport valve and installed the new pump/plumbing after which for several weeks the filter pressure was at 20 psi and the pump pressure was at about 23 psi. Everything was running fine at these pressures. Now a few weeks later I see the pump pressure elevated. During those...

Never touched the multiport valve at all. Everything is running beautifully. Only thing that I can't figure out is why the pressure at the pump has gone up.

Any problem with the flow out of your pool returns? No Does the pump have a "gauge" or display a number? Analog gauge with needle pointer in front of dial Is the pump running at the same RPM when it displayed 23 psi as it is now at 32 psi? This is a single stage motor so yes same RPM...

The pump has a pressure gauge on it. With a new filter cleaning the DE 6020 filter showed around 20 psi which is normal. The Tristar Hayward pump has a gauge on it as well and just after cleaning the filter the pump pressure showed around 23 psi. After a few weeks of running I checked the...

No more DE for me. I am switching over on my next filter clean to Fiberclear.

Those are excellent questions. Again if the Fiber Clear falls off the DE grids (fabric) and does not coat the grids again until the pump is turned back on does the open up a small window of time for dirt to find its way back into the pool until the grids are once again coated after the pump...

Regarding the use of Fiber Clear. According to the manufacturer, Fiber clear falls off the grids once the pump shuts off. If this is true then the grid material is taking the full force of the water pressure unprotected when the pump turns back on. To proctect the grid fabric it is said to...

Hours later and no DE in the pool. Perseverance, patience, logical and critical thinking to determine the root cause solved this mystery. If you are having this issue and the grids, manifold, manifold pigtail (if you're manifold has one) manifold o ring and spider gasket are good try either a...

UPDATE: I think I have figured out why all that DE was coming back into the pool. I took my Multiport valve spring to my local favorite pool store and compared the height of the compression spring with a new one. My old spring uncompressed measured 1.1" The new spring was 1.35" That is a...

Pictures of entire pool equipment

more pics

Here is what I have been using and am using.

Interesting. The DE I am using is for pools.

Here are more pictures....