low pressure problem

[wratran]

The valve are open....

I have not check the impeller on the pump. Can DE actually block the impeller from spinning? DE is so fine that i dont see it blocking the impeller.

[TheDurk]

It's not going to be DE. There is no setting where DE transits the pump unless something is seriously misconnected. How much did you dismantle to do the cleaning?

If you have an MPV set it to Waste. This will tell you if problem is in filter/returns (if you get good flow to Waste) or pump/suction lines/MPV (no flow to Waste).

I may be a noob here but I have been at this a long time.

[wratran]

i pull out one grid at a time...spray it and reinstall in the exact same spot.

By waste...i figure you mean backwash...it seem like it backwash OK...I can see dirt floating thru the clear glass. My backwash go directly to city sewer..so i can't see how much flow.

what i dont get is that....
when i turn on the booster pump to the polaris...i see no water at the return lines....with booster pump off...i see some water returns....