supersteveman Posted November 18, 2016 Report Share Posted November 18, 2016 I have a 1200L hot tub and use chlorine granuals as my sanitizer and non chlorine shock as well. Lets say I go to use the hot tub... The free chlorine level reads 2.5ppm. After use the free chlorine would be converted to combined chlorine and would read 0ppm free chlorine. So now do I... A) add the non chlorine shock first, then add chlorine granuals. or do I add chlorine granuals first then the non chlorine shock. Quote Link to comment Share on other sites More sharing options...
chem geek Posted November 29, 2016 Report Share Posted November 29, 2016 Non-chlorine shock is more effective at reacting with bather waste before chlorine does. Using it after doesn't work as well. However, with the Dichlor-then-bleach method (see sticky threads at the top of this forum) you should be able to use chlorine alone to maintain the water and would add chlorine after your soak in sufficient quantity to oxidize the bather waste and still have a small residual of chlorine for your next soak, if it's the next day. Quote Link to comment Share on other sites More sharing options...
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