On day 2 of SLAM. Posted test results from before I started. Was losing 5-6 ppm of chlorine a day so even though test looked ok figured something must be going on to be using that much chlorine. No signs of visible algae. Water looked fine but after first day of SLAM water definitely looks a little better so think maybe just didnt notice water wasnt as clear as it should be. Felt like i added so much chlorine on day 1. After initial slam to 28ppm since cya is at 70 i tested three more times and each time ppm was down in 15 range so added almost 2 more gallons. Think i added a total of 5-6 gallons during the day. Pool is roughly 15k gallons. Overnight test showed loss of maybe 1 to 1.5ppm. Hard to tell since using taylor test kit at 0.5ppm increments. Added chlorine this morning to get back to 28ppm and tested about 7 hours later and backdown to 15ppm again. So assume i need to add about 2 more gallons again? Just seems like I’m losing so much chlorine. Does this seem normal? Also learned that next time i will get cya closer to 50 or below before I SLAM again.