can't keep cya

I have 24' AG by 48". I opened the pool around memorial day and added a new bottle of cya (about 2 pounds?) and 1/2 bottle (about .75 pound) I had left over from last year, using the sock method. I got my cya up to about 30 (I always struggle trying to decide if the dot is there or not. It nver really disappears for me).


Sometimes I let the TC go to 0 since I can't seem to get other family members to help take care of the pool. There are some trees that drop a few leaves into the pool. Nothing major, maybe 5 or 6 maple leaves. Sometimes its a few days before I can skim/vacuum the leaves out.

So I was going good for a while, pool was sparkling. Now it's dull, and there is NO cya. I have been adding 1 gal of 12% bleach ($2.99 from Ollies, not sure if it's new or old). When I test in the morning, I get .5cc
alk is 60, ph 7.2


I am going to try sams club dichor to get stabilizer back up. But any clue what is eating the cya? I had this problem last year as well.