ok, checked chlorine loss overnight. Pool lost 2ppm (7.5 down to 5.5, .5cc)
so something must be growing at a low level.
I'm trying to make sense of all this so I can get it fixed.
Looking through my notes, In a nutshell, here's what has been going on:
passed oclt form 5/15 to 5/16
on 5/16, fc dropped from 24 to 8 during the day. I guess I should have realized that was excessive. the high salt light started blinking, or at least this is when I noticed it when I restarted the filter after a power surge of some sort made it shut off.
but oclt from 5/16-5/17 didn't drop at all, no ccs so I thought I was done shocking. water was very clear at this point.
salt cell fluctuated back and forth between "hi salt" flashing light and salt good on 5/17-5/21.
I had it running at 60-70%, losing 3ppm cl per day, but I was adding 3ppm per day of liquid chlorine. water still looked good, .5cc
on 5/21 and 5/22 I drained 6" of water (1 foot total)
added 3.5# cya on 5/23. ran swg at 70% all day. water tested from the union at the swg was 2 ppm higher than the pool, so the swg must have been making some cl, at least intermittently. end of day levels: cl=4.0, cc .5, pH =7.8
added liq cl to bring to 6.0ppm overnight. kept swg on overnigHt, cl=6.0 in am. i would have
expected it to have gone up.
water started to cloud up on 5/24, so I thought I'd try keeping the cl a little higher than normal to help. used liq cl, kept swg on at 70%, went from 7.0 down to 5.5
acid washed cell on 5/25. it really didnt foam up much. swg 40% all day, fc went from 8 to 4.5 by 6pm, so I added a gallon of shock. (should bring up to 8.0).
5/25 9pm fc 7.5, 0 cc
5/26 (this morning) fc 5.5 or 6.0, cc .5
Hopefully this is not too much info. I thought a summary would help the mods figure this out.
My best guess at this point is I have a faulty swg, whether it's from high salt (my bad). or the power surge (power company's bad). with my cya being 65 to 70 now, my fc was just a hair too low for that cya level, and with the weather heating up, and plenty of leaves and dirt blowing into the pool with the crazy hot, dry weather we have had, I'm just fighting a low level algae issue.
Nothing more exotic than that.
Does this make sense? Also, if so, what am I not doing correctly when I shock the pool, since I keep having to redo the shock process? I'm using a fresh set of tf100 reagents.
thanks