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Help explain free/total chlorine & when to oxidize

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Can someone please explain when I need to add chlorine and when I need to oxidize with MPS shock?


Currently my total chlorine level reads at max 10 on the strip, and my free chlorine reads at zero.  I’ve read so many guides to try to understand when to add and how to get the free chlorine levels up to 3ppm without the total being 10ppm.  And I don’t understand when I’m supposed to use MPS to burn off combined or used up chlorine?


Also lastly does the frog floating chlorine sanitation devise affect the reading on the test strip?  


I’m going crazy trying to understand how to get this routine down.  Have had it for 7 months now still don’t understand it.

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