Low PH with CYA of 60 how much FC can I have without risk of damage to the liner

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Durhamhouses

Durhamhouses

0
May 24, 2011
51
Toronto
I have a pool with sub 7.0 PH. FC is 11pm. It has green algae and I want to shock it. The CYA is around 50ppm. How much chlorine can I safely add? Obviously I have added PH Up and will wait but wondered what the tolerance or risk is in this case to the liner.
 
You may safely go to shock level with no damage to your liner.

For 50 CYA, shock level is 20FC. Pool School - Chlorine / CYA Chart

If you look at this graph stolen from Pool Water Chemistry
https://www.troublefreepool.com/~richardfalk/pool/HOCl.gif

You can see that 1 FC at zero CYA - less than tap water has - has the same unbuffered chlorine content as about 40 FC with 50 CYA.
 
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