My obsession with testing has leads me to the conclusion that even though pools are sanitized and kept to a healthy pH by most pool techs. The TA, CYA levels and CH levels are often way off. Our community pool had ZERO CYA, CH of 90, TA of 30, pH of 7.2, FC 15..5, CC <0.5 . The tech had just added chlorine 4 hours earlier.
I have checked several friends pools and keep finding this problem of CH being super low and TA usually very low also and to some extent the CYA higher than it should be most of the time. Is this common in the industry? Our health department only requires FC, pH, CYA and flow rate readings.
Is it cheaper to just throw more chlorine in than to add CYA? Baking Soda is cheap; seems they don't want to use that either. Calcium Carbonate is not inexpensive; are they afraid to use it due to the risk of staining/cost?
Your thoughts on the matter are appreciated