Help! High CYA/Switching to this from pool store testing and chemocals

Ilovemylife1129

Well-known member
Aug 7, 2018
63
Canonsburg/PA
Hello! I’ve had a pool for years but I’m here to stop using the pool store as they have gotten me into a mess! Following what they told me to do since we opened the pool in May of this year 2020 and our chlorine kept reading low and stabilizer high from them over and over and then telling me to put more chemicals in. Then they told us to switch to Pristine Blue and over 4 days our pool got more cloudy and a blue green color?! That’s when I found this and decided to give it a try. I read on a forum someone said to start putting a half gallon of Clorox bleach in a day until my test kit came. It came today and here are my results.
FC- 3
CC-0
TC-3
CH- 400
ALkalinity- 170
CYA-100

I hope this is right because I feel like I have no idea what I am doing as I’ve always trusted the pool store. Do I need to SLAM my pool or drain? Any help is so much appreciated!
 
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mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
32,623
Laughlin, NV
Welcome to the forum! Great decision to get your self a proper test kit and take control.
100 is the limit of the CYA test, so you have to do a diluted test. Mix 50% pool water with 50% tap water. Use this mixed sample as your test water. Multiply the result by 2 for your CYA level.
Once you confirm the level of CYA, how much water you need to drain and refill can be discussed.
I suggest you read ABC's of Pool Water Chemistry.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
32,623
Laughlin, NV
A 50-60% drain and refill will get your CYA to a reasonable level. I assume your pool is 48" deep so draining down 24-28" is about what you need to do.

Once you have done that and refilled, run the pump and mix the water well and run a full set of tests. Then adjust pH to 7.2 and follow the SLAM Process
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
32,623
Laughlin, NV
It is OK to swim before you drain. Keep your FC in the range of 9-11 ppm.

You can safely swim in a pool as long as the FC is above the minimum and at or below SLAM level based on your CYA. You must also be able to see the bottom of the pool in the deep end of the pool.
 

carnivalday

Gold Supporter
Bronze Supporter
Oct 25, 2017
581
Ocala, FL
I read a funny post here onetime about some guy slamming his pool. He had his kids test during the day, since he was at work. Kids knew that testing under slam levels was okay to swim, so when they tested and the number was under slam level, they'd hop in the pool for a bit.....then add chlorine back up to slam levels. Cracked me up.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
32,623
Laughlin, NV
Add that now.
Add another gallon this evening. Run the pump for at least 30 minutes and test your FC after the sun sets. In the morning, run the pump for at least 30 minutes and test FC before the sun hits the pool surface.