My pool is finally open ! The murky pond water I started with is now pretty clear, although my filter isn't especially happy with me.
I want to start out by following Water Balance for SWGs. Right now, the SWG isn't working, so I've been adding a little bleach to (hopefully) keep things under control until it is.
Anyway, the only source of CYA I could find locally (that actually listed Cyanuric Acid on the label) was Walmart's 4 lb bags of hth Salt Pool Care 3-in-1 startup, which hasn't gotten great reviews here.
At this moment, my TF-100 tells me the following:
FC - 1.0
CC - 0.5
pH - 6.8
TA - 40
CH - 80
CYA - too low to get a reading
Salt - 3400
Is the hth stuff a reasonable way to start raising CYA, or should I look harder for a pure source?