Weird looking black, dark blue rocks

Total hardness and calcium hardness in pool water.
Scale, calcium buildup, hard water and scaling problems.
Pool Newbie
Pool Newbie
Posts: 1
Joined: Sun 03 May, 2009 21:01
My Pool: salt water system, pool and jacuzzi the pool is 15,000 gallons
Location: United States

Weird looking black, dark blue rocks

Postby nataliefaith » Sun 03 May, 2009 21:10

We have a 15,000 gallon pool and jacuzzi. When I was cleaning the jacuzzi with a wire brush I noticed groups of dark black or dark blue little rocks that are connected to the plaster. They can not be scrubbed off with the wire brush but I can pick them off with my fingernail. They look like little flat rocks, I mean real little. Has anyone experieced this before? The jacuzzi has not been hot since last summer. Its a salt water system and while Im at it we also have green algae that grows in the corners. Any help would be amazing!!!


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