Have a zodiac swg since 05. Usually have it running on setting 1 or 2, out of 5. I used to keep Chlorine readings around 1-3, but have been aiming for 3-5 per the sticky here.
Earlier this year I cleaned the cells, and adjusted all chemistry per the guidelines here. Since a week or two ago, the C levels have been coming in at .5??? I bumped up the setting to 3... and then 4. Still reading .5 . I did the diluted acid treatment on the cells again... no change. They actually got the white stuff build up a little bit after just a week.
The water looks ok, maybe just a bit cloudy.
Is something growing in my pool? or do these things fail abruptly?