I'm sure this is going to be a "duh" question but here goes...
My CYA has been testing consistently at 80 for a month (TF-100 kit). A few days ago I tested CYA and it was 90. I haven't added any CYA, so my assumption is I just performed a bad test and should just test again, right? It can't go up without adding!
My CYA has been testing consistently at 80 for a month (TF-100 kit). A few days ago I tested CYA and it was 90. I haven't added any CYA, so my assumption is I just performed a bad test and should just test again, right? It can't go up without adding!