I started having an issue keeping the FC level up in the pool so ran the CYA test. Looks like my CYA is close to zero. Just stared getting some algae. Going through the shock process now.
Question 1: Is this normal to loose CYA over the winter?
Question 2: Does this indicate a leak? I have suspected a slight leak as I have very small air bubbles in the filter basket and have to add water every 4 days. But I have run many bucket tests and the amount of water I am losing is under 1/4 an inch over several days compared to the bucket. Leak detection companies do not guarantee they can find a leak unless it is 1/4" per day.