Assume CYA 0?

LaurenB

Gold Supporter
Jun 4, 2014
190
Fawn Grove, PA
Pool Size
22500
Surface
Vinyl
Chlorine
Liquid Chlorine
Happy pool season!

I know better than this but… my cya refill didn’t come before pool opening. I have lots of green algae. I’m ashamed (?) to admit I’ve never actually had algae before. Brown swamp, sure, but never actually seen the algae. This was my first season opening with a mesh safety cover. Anyway. My cya reagents are due to arrive today but until then… I want to start slamming. Can I just assume my cya is 0? It was 40-60 at closing (I can’t remember and I didn’t log it in pool math). I’m guessing the only harm it will do is me wasting bleach because I’m not adding enough to reach slam level in the even that I actually do have remaining cya. Should I just hold off? I added enough 10% to raise to 10ppm 20 minutes ago… retest showed .5FC and 2CC.

TIA! This place is awesome.