I’m scared to add this much liquid shock!

[Kfrey]

I have a 33k in ground. There is algae. Here are my numbers
FC 6.6
pH 7.3
Cya 80
Alkalinity 40
When I did the calculations, it’s saying to add 975 oz of 10% liquid chlorine... I’m scared to add that much to the pool at one time! How do I make sure it doesn’t bleach the liner???? Help!!!!

 

[tim5055]

Somewhere your math is wrong.

PoolMath tells me that to go from 6.6 to 16 (shock level for 40 CYA) you need 397 oz of 10%. That is slightly over 3 bottles of 10%.

 

[jblizzle]

I think Tim misread something ... the CYA is 80ppm so shock level would be 31ppm so around 1000oz of 10% is correct.

You will just have to trust us that it will not fade the liner ... assuming your CYA is in fact 80ppm and your pool is 33k gallons.

Also, when you test the FC, use 10ml of water so that each drop is 0.5ppm ... save some reagents.

 

[DeanP66]

Tim,

His CYA is 80, so his target FC should be 31. Kfrey, don't be concerned. The high CYA in your pool will buffer all that FC. You need to get to 31 PPM to SLAM the pool and kill all the algae.

 

[tim5055]

Yup, I will blame it on a nice glass of red wine. I read the TA and not the CYA....

Jason & Dean have it - 1,000 ounces. The CYA will buffer most of it so pour away.

 

[Kfrey]

How should I add? To the skimmer?

 

[tim5055]

How should I add? To the skimmer?

With the pump running pour it in front of the returns in the side of the pool. Mine has 5 returns and I pour a little in front of each one. The goal is to get it mixed into the water as quickly as possible.

Pouring into the skimmer is not really good for the mechanicals of the pumping system.

 

[mknauss]

How should I add? To the skimmer?

No. Never add chemicals directly to the skimmer.

Pour slowly at the return water into the pool. Use your brush every couple bottles. Put your pump at a higher rpm for 15 minutes or so after adding. Then you can reduce your pump rpm to a lower speed. Run your pump 24 hours per day during SLAM.

 

[Jimrahbe]

K,

Another option is to drain 50% of your water and get the CYA down to 40 or less, before you start your SLAM...

Thanks,

Jim R.

 

[Kfrey]

Alrighty then.... I was able to get 6 gallons in.. that’s all I have. It’s 11:30 pm here so I’ll get more ASAP in the morning and add. The algae wasn’t that bad so maybe this will do the trick? I know, I know follow the SLAM rules. Anyway, going to check first thing in the morning.