Pool was new last year. We had the double floor drain and the two skimmers all open and there was suction from all four places. The skimmers were drawing in water and the floor drain would suck down small debris. The normal pressure was 20 and the red arrow showing when it was time to backwash was at 30.
This year if I have the floor drain open the two skimmers barely skim at all and if I close the floor drains then they are fine. The return water is vigorous and seems the same as last year. The pressure on the filter is actually less than last year it is about 15.
So my question is - did everything work so well because it was all brand new last year or is something wrong this year. The guys who opened the pool filled the filter with new DE but that was about it. I don't think my filter is dirty and the pressure indicator is no where near where the red arrow is. When the pressure goes up does that mean it is time to backwash the filter. What does it mean if the pressure is less.