CYA sky rocketed

[briepage]

I did a bleach SLAM (cya was 50) when I finished the slam the cya was 113! How is this possible? I realize I’ll likely need to drain the pool but I don’t want to do this again I also put in muriatic acid to lower the pH before the slam but I didn’t add anything else.
HELP please

 

[proavia]

Welcome to TFP!

What test kit are you using?

 

[briepage]

Taking it to the pool supply store. We’re having some heating issues and the pool is 50 degrees would that impact it?

 

[PoolStored]

You have just experienced why we don't trust pool store testing. What you experienced is not possible.

We recommend these test kits. Link-->Test Kits Compared

The best place to find a Taylor K-2006C is on Amazon in Canada.
Link--> K-2006C on Amazon.ca

 

[briepage]

Update: I was told when I initially tested and got 50 for my CYA I hadn’t let the pump run long enough and that when the previous owners of the pool closed it they likely had super high CYA and a top up couldn’t get on top of it. So we drain and start over I suppose. The person I spoke with said that this is happening to a lot of pools as people are using the stabilized chlorine picks for simplicity.

 

[Donldson]

The person I spoke with said that this is happening to a lot of pools as people are using the stabilized chlorine picks for simplicity.

And does this person happen to sell stabilized pucks at their store?

How long did you run the pump before getting the sample?

 

[PoolStored]

Update: I was told when I initially tested and got 50 for my CYA I hadn’t let the pump run long enough and that when the previous owners of the pool closed it they likely had super high CYA and a top up couldn’t get on top of it. So we drain and start over I suppose. The person I spoke with said that this is happening to a lot of pools as people are using the stabilized chlorine picks for simplicity.

I would not do anything without a proper test kit. You may be dumping water when you don't need to...

A proper test kit will save you money...

 

[briepage]

I borrowed a friend’s Taylor test kit, it was reading over 100 sadly.

 

[briepage]

It was running for about 30 hours

 

[Donldson]

It was running for about 30 hours

That's more than enough time to mix the water. His excuse doesn't pass muster.