Opened my pool and noticed that there are some algae near the skimmer month (looks like black algae b/c it is a little thick and slimey). Also accidentally spilled some yucky stuff from the pool cover to the pool.
Decided to SLAM the pool. Two questions that I hope you can help:
1) To use the CYA chart (non-SWG pool). If I see 10 under "Chock FC", does that mean that I need to raise the FC to 10ppm?
CYA (Stabilizer) Minimum FC Target FC Shock FC
20* 2 3 10
2) After test the water, my CYA level is close to zero I believe (as the black dot in the testing kit never goes away).
To raise the CYA level, I added CYA to the pool in a sock, and it is taking a long time to dissolve and take effect.
Should I wait till the CYA level is above 20 before SLAMMING?
Thanks in advance for any advice.