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tecoral is right on with his numbers... most people start replacing filters and resin around 6-7, if your filter is not old, it may not need backwashed yet. It's hard to tell if you are not sure if there was dirty water still in the tank at the time you filled it. I wouldn't worry too much. You should be ok with the water at 6... just make sure you clean it out and test the next batch.
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