SLAM sanity check

[AW139]

Been maintaining my pool for a couple years, using the TFP method. So far so good.

Last year I opened to a crystal clear pool with 7.4 pH and even a trace of FC left. This year I opened to a green pool, pH around 6.8 and no FC obviously. Got the pH up, and stared the SLAM process. In about 3 days the water was decently clear, and was losing around 3 ppm FC overnight. Vacuumed out all the dead algae, cleaned the filter. So far so good. A couple days later the water is crystal clear, less than 0.5 CC (started at 1.5-2.0 CC), but still burning through the liquid chlorine. It’s been a week and still no end in sight. I top up to 24 ppm FC, and 4 hours later I’m down to 20. I’m still burning like 20 FC a day.

In the past I have SLAMed for minor issues, but didn’t take more than a couple days. Is it typical to take longer than a week even after the water has cleared to finish?

Number from before starting the SLAM:

8.0 FC
7.2 pH
60 TA
280 CH
60 CYA
1200 SALT

 

[PoolStored]

Have you done ALL of these:

• Brush the entire pool once a day if you can. Brush inside skimmers, under main drain covers, on weir doors, inside ladders, and behind removable lights if applicable.

 

[AW139]

Have you done ALL of these:

• Brush the entire pool once a day if you can. Brush inside skimmers, under main drain covers, on weir doors, inside ladders, and behind removable lights if applicable.

Yup. Brushed the pool pretty extensively a number of times. It’s a pretty basic fibreglass pool with no ladders, so not too many nooks and crannies for algae to hide in. Substantial algae came off the walls the first brushing, but nothing visible after that. Vacuumed a few times too.

 

[PoolStored]

Check weir doors for algae.

 

[AW139]

Check weir doors for algae.

I'll take a peak. I removed it for winterization so I don't suspect it will have any algae, but I can't be sure.