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Here's a pic of how she looks. I don't have many features that could be harboring algae, 1 wall return, 1 wall cleaner port, 2 floor returns, a main drain, the wall suction relief safety thingy, the light, and those 2 pockets for the rope. The hose you see if where I attached the vacuum hose...

Progress report time... Monday night I took it to 27.5 ppm, Tuesday morning it dropped to 19.5 ppm = 8 pm loss overnight. Tuesday morning took it to 26 ppm, by Tuesday after work it had dropped to 14.5 ppm = 11.5 ppm loss during the day. Tuesday night took it to 25 ppm, by Wednesday morning it...

This morning at 6:20 am, the FC had dropped from 27.5 ppm to 19.5 ppm, YAY! That means it's eating something up, right? So, I added bleach, tested again at 7:30 am, and it was 25 ppm. Since I'm going to work, I decided to take it just a little bit higher than 25 ppm, so I added another ~8 oz...

OK, SLAM is underway. I got home from work today and tested my levels again, all pretty much the same, specifically CC @ 1 and CYA @ 60, some visible pink smears on the deep end wall. Using the chart, I came up with 24 ppm as my shock level, so in went the bleach at 7:30 pm. I tested at 8:30...

Awesome! SLAMing is on the agenda. I realize now you used PoolMath to get that bleach amount, very cool tool. I'm getting the hang of it!

Thanks! It appears that you were looking at some of my fill water levels though. My pH is 7.2 and TA is only 70, still SLAM though, right? My follow up question is, about how much bleach do you think should be needed to take the FC up to 20-24 for the SLAM based on my pool size?

Hi there, I am brand new to the forum, but have enjoyed reading all of the helpful hints so much! I had my pool installed in July of 2011, and have had 3.5 summers of just humming along spending a bunch of money on the pool store chemicals and only really testing my pH and chlorine levels...