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Are there any tricks for daily checking of FC as the OTO test kit only reads to 5. Do i need to need to use the r-0870 and r-0871 daily, thanks for your help !! will try the vitamin C trick today.

I am a new here .the local pool store must of had a excess of cya to get rid of and sold me 16 lbs to put in pool.you know the results. So after buying enough chemicals to pay their rent, i found this site. after several partial drain and refills with well water and a TF 100 here are my results...