Topic
CYA is the number most owners never test and the one that quietly decides whether their chlorine works.
4 guides on this topic
Shock isn't a product, it's a level. Here's how to work out the right target for your pool, how much to add, and why the bag instructions fail so often.
Real models and real prices. Why a $150 drop kit beats a $20 box of strips, and what each one can and cannot actually measure.
What CYA actually does to your chlorine, why 30-50 ppm is the sweet spot, and how to bring it down when tablets have run it up to 100.
The five numbers that matter, the order to fix them in, and the doses that actually work. Written by people who've done this on real pools for 20 years.