Why do some people have 100, 200 or even 300 CYA??

[crocop]

I've seen a few threads with people throwing these numbers around and asking if they need to empry/fill the pool again.

How did they get to a CYA of 200+ to begin with?

I am about to bring my pool up to 20 CYA after the new liner/water goes in, but just wondering if there are other natural factors that can make the CYA sky rocket?

 

[JVTrain]

Constant use of trichlor tablets and dichlor granular shock products. Each time they are used, they add CYA along with the FC. For every 10 ppm FC added, dichlor adds 9 ppm CYA and trichlor adds 6 ppm CYA.

 

[crocop]

Constant use of trichlor tablets and dichlor granular shock products. Each time they are used, they add CYA along with the FC. For every 10 ppm FC added, dichlor adds 9 ppm CYA and trichlor adds 6 ppm CYA.

Ah ok got it. So its just them adding it in. I thought it was some natural element driving it up.

 

[pooldv]

Nope, don't worry, you will be fine. We call that Getting Pool Stored. I would go 30 on CYA, it is easier to measure on the test.