Crystals Below Waterline


Well-known member
Sep 15, 2018
Seminole, FL
Moved from HERE.

I have the same issue in just a couple of spots. Crystals below the waterline, either on a grout line or where the grout meets the pebble surface. When I remove the crystals there is still a white haze on the grout line and pebble surface where the crystal formed. The previously cited post had issues above the waterline, which would make using an acid solution feasible. What should I do to remove the crystals below the water line?

There are only 3 - 4 spots where this is happening. My water chemistry has stayed pretty good, even through the winter. It's mostly near the waterfall on the sunshelf (shallow water).
Last edited by a moderator: