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I finished vacuuming pool floor which had acquired quite a bit of silt/sand. After doing so, I backwashed my DE filter 3-4 cycles until the backwashed water flowed clear. After turning the valve from "backwash" to "filter" in order to re-charge my filter with DE, I see dirty water flowing back...

I have a tanning ledge with a bubbler and I've noticed a salt-like residue that settles on the ledge after several days of not sweeping. It isn't salt, but is grainy like salt/sand and white in color. My calcium content is on the high side and I've had issues with scaling on the tile/grout...