So I just checked my filter pressure and it has dropped from 14.5 psi to 12.5 psi. I did not back wash or do anything at all. Why would the pressure drop on its own? It's a brand new, oil filled gauge also, I installed it last week.
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Something blocking the suction side can cause that. I've seen it happen if a large pile of leaves ends up in the pump basket.
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Get 5 gallons of bleach and 1 64oz bottle of Algetec. The Algetec will knock out the green and it has a clarifier in it too. Brush the entire pool right after you add both chemicals and run the pump 24/7. It will be blue in hours.
Algetec is not a product we recommend, is it? It isn't even Googlable...