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I researched this about a year ago or so when my water wasn't reacting the same to my normal routine. I took my water into Leslies and the only thing that was high was CYA. My understanding is there really is no concern unless it is very high, and up to 100 is normal. IME I just used up more dichlor than normal with high CYA. You can't lower CYA without a full dump, so as long as your water is good, I wouldn't worry about it. Also, if I remember correctly if you shock with dichlor rather than MPS you will raise the CYA faster.
Do you know why dichlor raises it faster than mps?Thanks for your help Brooke.
Dichlor will raise CYA levels. MPS will not because it does not contain any. MPS will raise TDS. I have never been concerned with TDS. I obsessed over CYA a couple of years ago, not any more. I like to sanitize with dichlor and shock with MPS. Shocking with dichlor will raise CYA quickly.
No need to reply anymore to this topic. Thanks to CapMorgans links in a different thread I have a much better understanding of CYA.
If you are changing water every 3 or 4 months, neither TDS or CYA should be a concern.