Advice from someone with experience

[Johnvalliere]

QUICK BACKGROUND = We've lived in our pool home for one-year and our levels are always spot-on. I check and adjust every M, W, & F. We've never shocked and never done more than add a little acid or alk increaser. Recently we've had some serious rain, and our FC zeroed out for a day. We've been struggling to get FC above 2 for a week with SWG set at 80% for 9hrs per day. Last night I dumped in 2gal of year-old 12% liquid.

STATS = As of this morning 7/30, here are our stats:
FC = 2
CC = 0
TC = 2
BRO = 4
PH = 7.4 (was 8+ before adding acid last night)
ALK = 90
CH = 225
CYA = 30
PHOS = 0

QUESTION = I'm going to drop 64oz of 6% bleach in tonight. Does anyone with more experience have any advice?

 

[Richard320]

You need higher CYA for the Florida sun. The SWG is working overtime making chlorine just for the sun. And year-old bleach is 25% strength, if that.

It's unlikely you got algae from one night of low FC, but just the same, you probably ought to run the Overnight Chlorine Loss Test to be sure before you raise CYA.