I run CYA 20-40 ppm, which is the bottom of my K2006 testing range. The K2006 appears focused on those running their CYA higher. Is there a kit that covers a lower range?
And for that matter, if the focus were on a lower, narrower range, is there a kit that reads more accurately (e.g., 5 ppm increments) and/or easily?
Even after practicing with reference solutions, I never feel as confident or accurate as I want to be with CYA. CYA testing must be difficult, because I've heard of pool stores having trouble with it. And our health inspector (this is a community pool) clearly struggles to get meaningful data as well.