I'm a new pool owner frustrated with this fine white residue on the walls/floor of our pool (the attached spa seems to be free of this problem somehow). When I brush the area the residue clouds a bit and moves some but never really goes away and the robot does not seem to be able to pick it up.
Here are the current numbers:
FC 7 (coming down from recent attempt to slam - before running out of reagent)
I have searched the site for similar problems and came up with these possibilities:
When we started out the FC and CYA were 0 and the CH was 0 (our city water registers with 0 CH)
The pool was neglected for year(s) and was green on day 1 (see last photo)
Pool plumber guy (who fixed multiple leaks) tried a muratic acid test along the wall on Friday and the residue came off so he suggested draining and acid wash.
Pool cleaner guy who vacuumed a bunch of debris and dead algae said he is clueless and did not offer any recommendations.
Since you can see a horizontal line where the old water line was I wonder if that means that it is damage to the pebbletec and the white cloud that comes off is plaster (I really hope not)
My next thought is to do the SLAM again (now that the larger reagent arrived) and follow by the mustard algae level for 24 hrs
Thank you for any advice!