When testing my CYA, I'm able to see the black dot with the cylinder completely full. Last year I definitely had CYA so why would it be gone now? I live in Central Valley of California (hot in summer). It is my understanding that CYA does not evaporate.
I'm using test solution purchased from TFTestKits last year. Could it be that I need new solution?
Thanks,
Dave
I'm using test solution purchased from TFTestKits last year. Could it be that I need new solution?
Thanks,
Dave