Cheers Groves.. good to see you still here too my man. You can probably still use it in hardwater areas.. my starting ec is now a whole 1, but I can juuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuussst about get away with using it at 0.25ml/ltr once.. and after that you can be sure I need to add mag to the soil.. but I do try to get at least one little dose in per plant-cycle. So if, say, your tapwater has an ec of anything up to 0.6.. I reckon you could safishly use about 0.5ml once in mid-veg.. but on its own without feed or other additives. In fact you may be able to use more depending on your water, but safer than sorry seems to best when we're growing tasty weed
Even once is sufficient go get some good stuff into the soil.
It's just that bloody calcium buildup in the soil over time that locks-out mag and then potassium.
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