If you lost 2ppm of FC overnight then your SLAM is not complete. What was your CC level? A SLAM is not a one or two day event, shock level must be held until you pass all three criteria to complete the SLAM.Was at 17 ppm last night and 15 this morning with a cya of 35. I didn't put any chlorine in the pool all day while I was gone because I wanted people to be able to swim tomorrow. Just tested it at 6:00PM and I get a reading of 10 ppm. Pool is crystal clear. I had an algae problem beginning of the week kept it at slam level for a few days (worked great) and now I'm getting nervous. Using non stabilized chlorine sticks in the skimmer basket all summer. Just put a couple in. Could I be in trouble? Don't like the Chlorine drop off.
Dom,
This is what I use. It says in their literature that it is unstablized. Look for the bucket with the Yellow top. Poolife.com
poolife® Active Cleaning® Caplets Chlorinator