I did an AA treatment of my water at the beginning of February; it made a huge difference as the plastics has turned brown from iron over the season since the replaster. I used polyquat to buffer the pool while I had the chlorine at 0, and things stayed clear. I've since started to rebalance the pool, and things are going fairly well by the numbers:
pH 7.7 ( I added some acid to bring it back down to 7.5-7.6)
Borates 50 (Carryover from an old test)
Sequestrant 14 (taken with a magic Jack's sequestrant test drop kit)
Over the past couple of days, I've noticed the water turn green in the pool, most noticably in the late afternoon. The water is still clear however. I don't know how the CYA dropped, as I have a reading within the last month of 50 and I had added additional CYA to get me closer to 70-80. Water temp is in the 60s, but I wouldn't think that would cause a false reading this far off...does ascorbic acid, polyquat, or the sequestrant have any possible role in this?
Here are some pics (imgur link)...am I looking at the beginning of algae, or is this a metal thing? I remember when they first filled the pool after plaster, the water turned a green color like this, and they added a sequestrant (super sequa sol) and the water stopped being green. Obviously I need to add CYA, but what action shoudl I take to remedy the green tint? Notice in the last pic the difference between the pool water and the spa water. The spa is overflowing into the pool, and the water that is causing that overflow is being pumped from the pool, so I would think if it were algae, the spa would be turning green too, along with a high CC which simply isn't present...
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Also worth mentioning, the pollen has started falling here...