tbrown
Cronies #3?? Heathens' Coffee Snob???
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Salt can be mixed regardless of brand as long as the salt to water ratio is the same on each. IO and RC both mix at approximately 2 cups to 4 gallons for 1.026 SG so they're good to mix. Alk, calc, mag, and trace will be different between the two potentially, but SG should be equal.