dayday1 Posted October 20, 2021 Report Share Posted October 20, 2021 Posted a couple times and no answer I am thinking I am posting in hot tub water chemistry if not please let me know. Thank you I used the DPD method and if doing right I use 10ml of water which gives me .5ppm for each drop. If doing right I add the 5 drops to see if it turns pink indicating CC which I have done and it's .5ppm or one drop of titrate turns clear again. When this happens I add chlorine to 10ppm or more shock the tub and the CC goes away, no pink. However this time when the tub got to .5 CC I added 15ppm of chlorine left the top off and ran a couple cycles and still getting .5 ppm hours later. Does this mean its time to change the water? Add an oxidizer? More ppm of chlorine? Not sure what to do??? Thanks @waterbear Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted October 24, 2021 Report Share Posted October 24, 2021 Sorry my friend, I am not familiar with that test. The fact that you continue to read cc could indicate a contaminant buildup in the pipes, called biofilm, that is converting chlorine continuously. Has your chlorine demand increased recently? Have you heard of ahhsome? Quote Link to comment Share on other sites More sharing options...
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