Hiya Lisa, I'm not planning an irrigation system myself, so I'm definitely not the person for specifics. However, when growers refer to a two-tank system, I think you'll still need pressurized clear water as a third line to make the meters work. Or maybe not, someone will chime in probably.
My understanding is calcium has a caking problem when mixed in solution. In a two-tank system, one is ferts/magnesium the other calcium.
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