Quote Originally Posted by Wilco View Post
Ok , here's the last 24 hrs. Not encouraging. Yesterday 7 am, cl at 4, I added a gallon of bleach. Retested at 4 pm, it's at 5 ppm, with 1ppm cc, added a gallon retested at 5 pm it's at 10 ppm, added another gallon, an hr later at 7 pm it's at 16 ppm. Ran pump all night. Test this am showed 6 ppm, zero cc.
Carl, in Wilco's overnight test he lost 10ppm FC. That's why WaterMom took him to shock level.

Wilco, we originally said 15 because with your CYA level, 8-15 is your maintenance range. Now that you have determined that you are losing FC overnight, we know you are fighting something unusual in your pool and need to shock it at 25.

Yes, you need to add bleach in the morning too. Your goal is to get it to 25 and keep it there as much as possible. If you can, make additions mid-day too.