Hi all! I have floating, snowy, flakey looking white stuff in my pool and spa, but more in my spa. It settles in drifts in the spa. I vacuum it out with the PoolBuster, but I can't get it all.

For a year now, I have assumed that it is some sort of calcium precipitate. My water is clean and clear otherwise and no algae problems at all. I test with Ben's kit and normally only have to control for ph with my swg running. I do have pretty high Calcium readings of 520.

Could it actually be white mold? Is there some way to analyze the stuff I get out of the PoolBuster to verify?