Still Trying

RCarnochan

Member
May 19, 2019
13
Greensboro, MD
My pool is getting better, but still trying to understand CYA. My FC is 9 right now, I just added 4 gallons of bleach to raise it. Adding this raised my FC to 28. Currently CYA is 30. I have stabalizer in the pool. I have consulted the CYA/Chlorine chart and it says that my CYA should be 70. Is is ok to still slam even though my CYA is not yet where I need it.
 

thetekgeek

Bronze Supporter
Jun 8, 2018
62
Nebraska
The real pros will be along shortly, but during a SLAM you want to have a lower CYA because it will require LESS bleach to clear your pool. With a CYA of 30, your SLAM FC should be 12. Any bleach you add that brings FC much above 12 will be quickly consumed by the sun. Test and dose as often as possible to keep your FC at 12, raising FC to 28 is simply pouring money down the drain. After your SLAM is over and your pool is in perfect shape, you can raise your CYA up to 70, if that is your goal.
 

mknauss

Mod Squad
TFP Expert
May 3, 2014
17,896
Laughlin, NV
As thetekgeek said, do not raise your FC significantly above your SLAM level FC. Not only is it a waste of chlorine, it can damage your vinyl liner.
Only raise your CYA to 70 when you are going to use your SWCG to maintain your FC in the target range. Right now you are in SLAM mode, so your pool is treated as a non-SWCG pool.
 

RCarnochan

Member
May 19, 2019
13
Greensboro, MD
Thanks so much , that really clarifies things for me. Treating it like a chlorine pool changes all the numbers. I will let the FC fall down to 12 . How long do I keep the level at 12? When do I start using salt
 

mknauss

Mod Squad
TFP Expert
May 3, 2014
17,896
Laughlin, NV
When you complete the three criteria for a successful SLAM, you will add salt and CYA and adjust your FC, if necessary, with liquid chlorine and start the SWCG.
 

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