I tested twice to be sure with the TF-100 and both times less than twenty. Emptied the entire bottle of reagent mixture and the dot was just as clear as can be. Last time I checked it was 30....that was just a couple months ago. We have got alot of rain. It never crossed my mind to watch this.
Back to the problem...Low if any cya. I've seen BECAREFUL if cya is truly zero numerous times. The pool calc tell me I need 16 lbs! What do I need to do and what is the hazards of no cya?
Jason and Waterbear...I'm still working getting the copper down and adding bleach slowly. Still at .5 ppms copper.
I'm getting my water ready for the SWG system.
Getting it balanced and adding borates.