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My spa pool chemistry guide claims that the test strips are not accurate for measuring chlorine in a spa pool with UV and ozone. Why might that be the case? My spa pool company also sells me the chemicals, so they're incentivised to get me to over do chemicals.

The test strips are branded spasupplies and test for total hardness, free chlorine, total chlorine, total alkalinity, and pH.

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    $\begingroup$ UV and ozone may alter composition of active components of the strips, so they give altered color intensity as reaction with active chlorine. $\endgroup$
    – Poutnik
    Commented Aug 26 at 11:07
  • $\begingroup$ Take a sample inside where there is no uv and ozone? $\endgroup$
    – porphyrin
    Commented Aug 26 at 11:38
  • $\begingroup$ Ozone and chlorine disinfect in a radically different way and their tests are different. $\endgroup$
    – ACR
    Commented Aug 26 at 14:43
  • $\begingroup$ Add more details about the unnamed test strips. $\endgroup$
    – ACR
    Commented Aug 26 at 14:44
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    $\begingroup$ The guidance manual recommends a shock dose of chlorine every two weeks and a small dose after every use. It seems like a lot. People in my area complain about clothing getting ruined by spa pools, which suggests to me that people typically overchlorinate their spa pools. I would like to be able to test my chlorine levels to ensure they don't get too high $\endgroup$
    – kennyB
    Commented Aug 27 at 9:19

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