Just threw in 2 gallons of liquid chlorine. We have an auto cover, so I am wondering if something is wrong this the SWG as I usually had it running around 10-15% and my FC would sometimes shoot up to over 10PPM. Pool was looking fine on Friday and was cloudy Monday evening.
Keep the cover off for the slam & give it a scrub.
Your cell running @ 15% for 24 hours only gives you 1.3 ppm fc.
Even with a cover that was likely not enough & you fell below minimum for your cya at some point while you were away & algae grew.
The trajectory here goes—>
SLAM Process until passing ALL 3 end of slam criteria —> then you can do an overnight chlorine gain test to determine how your cell is functioning.
I suspect it’s functioning fine & what it is producing is keeping you from having a green swamp. But try as it might, your swcg cannot overcome an algae issue & the algae will eventually win without intervention.
SLAM ON
For a successful SLAM Process
you need to continue to MAINTAIN Slam level fc for your cya
FC/CYA Levels
as often as possible (multiple times per day is best) until you meet ALL 3 end of slam criteria-
You are done when:
CC is 0.5 or lower;
You pass an Overnight Chlorine Loss Test
AND
The water is clear.
(Crystal Clear w/no algae dead or alive)
*Check & scrub every nook & cranny where algae may hide (light niches, steps, drain covers, ladder handrails, skimmer throats/weirs, abandoned lines, autofill, overflow drains, etc.)
*If water can go there, algae can thrive there.
*Run slam level water through all water features & lines for at least a couple hours a day during the
SLAM Process.
*Brush & or vac daily (this breaks up biofilms that algae uses to protect itself from chlorine)
*Backwash/clean filter when pressure rises 25%over clean pressure.
www.google.com