Easier to add a little CaMg to the water the pot stands in - 0.5ml/L, no measuring or numbers to think aboutLet someone else chime in, but I use about 300 ppm's.
or about one teaspoon pre gallon or 4 liters will give you around 250ppm's or so.
Hope this helps.
Be safe, and grow well my friend,
Tok..
edit: Sorry I use RO water. If you are not using RO you will need to factor in your normal water ppm's.
Blue Dream Clones Sea Of Green Grow Journal
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