SLAM question with autocover

amytude · Jun 9, 2020

So based on advice from here, we are trying to SLAM our pool. The online calculators for how much bleach I should be using must be WAY off. We really want to swim! I added bleach last night, then took readings again, no FC loss (it went up 2ppm) but I have an autocover. I see from a past search I should be keeping my autocover open. Can I add bleach during a hot sunny day and close the autocover or is that a huge no-no? For the past 3 days, we have been doing exactly that at sunset. Add bleach, close autocover. Currently:
FC 17 (I realize I have to get this up to 30 to kill algae)
CC 17
pH 7.2-7.4
TA 90
CYA 50 (added some stabilizer today)

So, should I just wait until tonight and add more bleach?

Richard320 · Jun 9, 2020

If CC is 17 you better leave that cover open for a few days, just to get rid of it.

And why are you raising CYA during a SLAM? The higher the CYA, the higher the FC has to be.

amytude · Jun 9, 2020

Be patient with me as I’m learning all of this stuff. I’m trying to raise it up to 30 ppm to get rid of algae.

amytude · Jun 9, 2020

Don’t know why my signature isn’t on here with pool stats but i have 36000 gallons with Swg

splashpad · Jun 9, 2020

amytude said:
Be patient with me as I’m learning all of this stuff. I’m trying to raise it up to 30 ppm to get rid of algae.

FC = Free Chlorine (the first part of FAS-DPD test)
CC = Combined Chlorine (second part of FAS-DPD test)
CYA = Cyanuric Acid, what protects the chlorine from UV burn-off
The FC/CYA Levels

YippeeSkippy · Jun 9, 2020

CYA does not get rid of algae.....it will encourage it if you don't keep the FC high enough See-->FC/CYA Levels

Maddie

amytude · Jun 9, 2020

Yes I know this. I thought Swg pools needed more cya. I got it, forget the cya. Fc=17. Just added over 900 oz of bleach as per the calculator to SLAM for algae.

RMcGirr83 · Jun 10, 2020

Your cartridge filter is only 120 sq ft for a 36k gallon pool? You'll be cleaning that quite a bit.

YippeeSkippy · Jun 10, 2020

With my autocover I tend to keep my CYA on the slightly lower end for a SWG. Its a choice I make knowing that it won't be getting as much sun.
I agree with the above- that is a very small filter for that size pool!

Maddie