Quote Originally Posted by salinda View Post
Is there some way to analyze the stuff I get out of the PoolBuster to verify?
If you add a little acid to a pool/spa water sample with this stuff in it and if the stuff dissolves, then it is likely to be calcium carbonate. I don't think that mold will "dissolve" with a little acid (to get the pH down to 7.0 or below -- no need to go below 6.5).

However, even with high calcium readings of 520, your TA would also have to be very high in order to precipitate calcium carbonate. Your TA would probably have to be well above 200. Also, I would think that your water would be cloudy as well. So I'm thinking that this isn't calcium carbonate. Let us know what happens with the experimental test.

Richard