We followed the protocol and slammed our pool last month for algae. Pool looked great, (aside from a black residue which we wont able to identify.But this eventually went away too). (Also when we turned our SWG back on, it seemed to not ready currently saying our salt level was much higher than what it was: saying 4000-4400ppm when test kits showed around 3500ppm. We're still working on getting the readings correctly, but that's a different forum question.)
Over the last week, we've noticed a few spots on the floor of our pool where it looks like a greenish/yellowish dust. Disappears when we go to sweep/vacuum it up (much like an algae would). It is not on the walls, just along some of the seems and in an area that stuff seems to settle (right before the shallow end changes to deep).
I'm wondering if Algae can still live in you pool, even when it passes the three tests:
OCLT (1ppm last night). CC .5 and water remains clear ?
Or do you think this is possibly something else, like pollen. (I havent been able to touch this substance, because it vanishes when I get close to it).
I have not "slammed" the pool, because I'm not sure if this is necessary, being that we've so far passed the three tests. What do you suggest?
I'm going to test it again tonight to see if any change.
Also another question: When doing the overnight OCLT, do we need to leave our autocover off? (I have, but was just wondering if this was really necessary or not).
Here's our current numbers for our pool:
CC .5 (this morning)
SWG reads 3700 (although test strips show 3200ppm).
Thanks for your response.