I’m at a loss so reaching out- This is my first year using our AG pool, it was installed by the previous homeowners. I’m religious about keeping my chemicals balanced and cleaning/vacuuming it every other day. Despite all of this, there are brown dirt/sand spots that accumulate on the bottom of the pool. When I empty the vacuum it’s full of sand. Is this coming from my filter? Our previous pool was smaller with a different pump system and I never had problems keeping it clean. Any advice would be very appreciated!