The pool originally was chlorinated with an automatic feeder using trichlor pucks by the previous owner. I also used the feeder until it broke and I learned the ways advocated by this forum. It's been a few years since I checked the CYA but even back then it was 100+. Also, I've gone back and forth on using pucks in a floater in addition to bleach but I guess I should stop that?
With this green outbreak, I have been checking cl daily and keeping it at 30ppm. I cleaned the cartridges a few weeks ago, pool was already green at that point. They are the original cartridges (10 yrs old) but have been well taken care of.
It doesn't seem like the filter or pool vac are getting rid of anything. Will it just magically clear up over time? Should I do a partial drain to try and lower the cya?
Thanks for your help!