Hi all - Apologies in advance...I know there are a million algae threads. Here's the backstory....we bought the house in October...pool was closed up and hadn't been open for probably 2 years or more. So it was BLACK when we first opened on 5/1. Took us a month to pass the SLAM...but we didn't open up the pool light which was full of the same black sludge we discovered the other day. Obviously we didn't REALLY pass the SLAM the first time with that remaining hidden sludge. Didn't know what I didn't know! So Tuesday afternoon I noticed yellow streakiness on walls / floor and thought it was weird since I've been so on the ball watching our FC, CC, and CYA. I got on the website and concluded I needed to start another SLAM. I *think* it's mustard...definitely not pollen....it's on the walls and floor. When I brush up the yellow streaks it comes up as very fine yellow dust. I read a thread that said to complete a regular SLAM first and then do a higher (40% of CYA) SLAM for 24 hours, plus disinfect everything that's been in the pool. I'm preparing to do that. Started the regular SLAM Tuesday night. Screenshots of test results/bleach additions below. It is normal for the algae to get worse before it gets better? Just weird to me that it's been 36 hours between 14.5 - 19ppm and the water and algae streaks look worse. Anyway, appreciate any thoughts. Otherwise will stay the course on SLAM!