Quote:
Originally Posted by spedly
Anyone using Aquaforest Reef Salt ever measure calcium of fresh salt water? I just received a Hanna checker for calcium the other day and this morning I decided to measure it - it came out to 474. Is that consistent with other people's measurements?
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I don't like the Hanna Calcium checker -it always reads about 50 ppm higher than Salifert and Elos when I used it.