I've been here before and you good folks helped me with some serious balancing problems I was having about over a year ago. I have the recommended testing kit and it seems my CYA level is either extremely low, or non-existent. after thoroughly mixing the solution, I have completely filled the skinny test tube and can still see the black dot quite well.
The problem I had over a year ago was off the chart CYA levels due to years of using chlorine pucks in my 8200 gallon above ground pool. I had chronically low ph that was evidently destroying my filter cartridges in short order. I have one large cartridge in my Sta-Rite system and was having to replace new ones in less than a year because deposits caused by the acidic water were clogging the element and my water wasn't circulating properly. Couldn't even keep the water clear running the filter 24 hours a day! This went on for several years while I spent a small fortune in chemicals and cartridges. I was just about ready to drain the thing and give up when I found you folks here at TFP. You saved my pool, and me from financial ruin!
So anyway, I drained probably 3/4 of my water and started using liquid chlorine. These days my pool is crystal clear and filter pressure nice and low. but I'm thinking I need to bring this stabilizer up a bit. After all the problems I had I'm a little nervous about doing this, as it was the cause of all my troubles to begin with. (Don't want to go back there!!!). So I just wanted some guidance on the safest way to add CYA to my type of pool without going overboard, as well as any particular product type you might recommend. Thanks so much for all of your help, past and present. If it wasn't for you all, I would have given up long ago.