New pool opened 3/14, so the PB added DE to the filter on 3/12 maybe. Brand new hayward filter. He set the full speed pressure gauge at the top.
It's six weeks later now, and we still have a lot of dust accumulating on the walls and floor. Secondly, the full speed pressure is still where it was on day one.
So I'm wondering if maybe he didn't add enough DE to really cover the grids on start up, and the water isn't really filtering. How can you tell? Surely the pressure should be up a little by now. If I just add a cup of DE to the skimmer, would that hurt? How can you tell when you've added too much?