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I have not found a ratio to be critical with Ca and Mg.
Generally tap water is high in Ca and the ratio is 10:1 or greater in some cases.
As long as the plants have enough nutrients, the ratios are not an issue. They become issues when the levels get too low to supply the plants with enough of that nutrient.

The ratios of and in themselves are non critical.
But you'll waste less by using a ratio:)

You can try this independently easily.
Use CaCl2 and MgSO4 and then for KH use baking soda
You can easily, quickly and cheaply achieve any KH or GH you want.

Tom Barr
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