Right, I forgot to check the SLAM article. ThanksYou follow the SLAM Process until you pass all 3 end of slam criteria. Test fc & add liquid chlorine every few hours to MAINTAIN Slam fc level for your cya.
Always round up to the next “10” when measuring cya so yours is 40ppm - this means you need to maintain a fc level of 16ppm. FC/CYA Chart
Every hour you fall below slam level algae wins.