Our FC dropped to 0 this past weekend. I was out of town and family came to use the pool. They left our auto-cover open most of the weekend, and I don't usually have our SWG running high enough to cover that situation. We only open the cover when using the pool, so our SWG is dialed in for that situation.
I brought FC back up, but in the mean time, the water clouded. So I assume it's time to slam.
Last night, I did an overnight FC loss test. Water showed an FC of 5.5 around 8:30pm. Tested again this morning at 8:30am and we're down to 3.0. So we're just over the 1ppm threshold from the overnight test. Should I wait a day or two and see how things go? The water has already started to clear up a bit, but still not the crystal clear I'm used to.
Also I noticed the SLAM / shock level chart says 24PPM, while Pool Math shows 20PPM for shock. Which is it (Knowing that a 4PPM difference at this point isn't a big deal. . .)
Here's my full test results -
CYA 50 (Was working on this before I went away. . .)