Shelley, it takes a lot of mixing to mix up alkalinity supplements. There wouldn't be much calcium in a cup of tank water, so the extra flakes would not be particularly noticeable in with the alkalinity supplement. I mix up 2 gallons of alkalinity solution at a time for my dosers. I store that in a sealed container and use that to add to the actual dosing vessel once a week. The 2 gallons lasts a few months I think.
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~ Mindy
SPS fanatic.
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