I have been using io reef crystals for years but I'm having issues as well. I buy my salt the only place in town which is petsmart. The last 2 160g pails and 50g bag that I have bought there have all read .25-.5 ammonia. Checked test kit on the fresh rodi water with 0 reading. Also checked test kit on tank which reads 0. I will no longer use io reef crystals. I have also had several fellow reefers in town check theirs and they all have the same readings.
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