So started a slam three weeks ago. 40k gal pool. Fighting green and cloudy where I couldn't see the second step for a year and a half. Finally fired the pool company a month ago. Start of the slam, had zero cya. Brought cya up to 40 and waited three days, held at 40. Brought ph down to 7.2 and started the slam. I've gone through in the neighborhood of 300 gal of bleach in three weeks. I've been brushing about every other day, but this morning got aggressive with it and used a wire brush. (Gunnite pool). This morning (8 hours ago) when I checked my FC level before brushing, my FC lvl was 25. Just checked it and it's down to 4. Added three more gal of 8.25% bleach and then out of curiosity, checked CYA levels again due to the high chlorine consumption during the day. CYA is back at zero after testing it twice. This would explain the excessive chlorine loss over the last 3 weeks as well as the slow results on the slam I think due to the wild swings in FC levels. But what would cause the CYA consumption? I do not have a leak in the pool and have added minimal water over three weeks due to evaporation.
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