OK, help please, Dang mustard algae! - 15k gallon pool/spa combo.
I've slammed twice now. The first time I didn't use the proper test kit, I winged it for three days with test strips. Added probably 5 jugs of Lowes 8% bleach over about 4 days (2 jugs to start).
Couple weeks later - it's back.
So now I order the test kit and SLAM according to the directions here. Took about the same, 3-4 days but at the end the pool passed the overnight FC loss test.
In fact it took a few more days to figure out the new Intellichlor % setting to bring the FC level down to 2.0ish. (25% on the intellichlor). So the FC level test for several days after was always above 2 and initially up around 5.
And the Dang algae is back! Not as bad, just a few walls on the shady side, but it's back.
I tossed every pool tool in while SLAMMING so I don't think I reintroduced the algae, but I'm at a loss now on how to get rid of the dang mustard.
Any more suggestions?!?!
Thanks