SAM517

New member
May 14, 2025
3
DFW
Have a newly replastered in ground salt water pool that runs with a cartridge filter system that does not require backwashing. Pool was regularly brushed as instructed & was very clear for first few weeks then brushing began to stir up cloudy substance & robot began to pick up tons of said substance & continues to do so weeks later. Pool has been vacuumed & filter cleaned but substance continues to be present. Contractor & plaster company say it is DE which should not be present at all. Could it be bad plaster? Thoughts? Even if DE was put in by accident, which I don't know how could have happened, wouldn't it eventually go away? I'm into this mess for 2-3 months now.

Photos of what robot has retrieved plus edge of pool where plaster meets tile-sloppy job. It does look like DE but no one should have/would have added that.
 

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Last edited:
Welcome to TFP.

Take a pile from your robot cleaner and put some muriatic acid on it. If it bubbles then it is calcium and probably plaster dust. If it is DE or dirt it will not bubble.

Show us pictures of what your robot is capturing.

Let us know what the acid test finds.