[PICTURES DOWN BELOW.... PLEASE SCROLL]
I've had a vinyl pool (30k gallons) for about two years now. This year I noticed some white, powdery substance in the bottom of the pool, and on the steps. It's like a really light colored brown or whiteish. It's very fine, so if you go anywhere near it, it gets stirred up and appears as if it's gone, but then resettles.
I have a Polaris 360 on an auxiliary pump that keeps it pretty clean anyway. Recently, I repaired the Polaris but the problem is now the Polaris is only too good at climbing and has been getting stuck by getting the air hose wrapped around the outlet for the hose or itself.
In any event, I'll often find the Polaris wrapped up around something after a few days. Since the Polaris is not running, I've noticed a buildup of this stuff that probably would have just gotten picked up by the Polaris in the past.
I suspect it's coming from the filter since the screen filter for the Polaris has gotten clogged twice with this stuff so far this season.
Anyone know what this could be? DE from the filter? Calcium? A byproduct of the chlorine (I use liquid chlorine from the pool store, but use pucks on occasion)? I tried to get some pictures, but couldn't get anything that accurately shows what it looks like.