Randy Holmes-Farley
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My Tank Thread
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Hmmm, not sure where to go with this now. I have checked all my mixing equipment and there is no corrosion so if my saltmix has a zinc reading of 160 µg/l but the aquarium has a lower reading of 37 µg/l, to me the source is the saltmix. If the zinc is not coming from the water, then that leads to the salt itself.
The only thing that I can think of is that I only mix the salt for a few hours before I took the samples to be sent off for testing. Could it be that by mixing for the full 24 hours, some of these elements reduce out as they need this time to mix in correctly? Just checked the side of the salt bucket and there is nothing listing the minimum amount of time the salt should be mixed for.
I don't think the zinc generally precipitates from new salt water.