Quote Originally Posted by headshake
you don't usually need calmag+ for tap water. as rusty stated, calmag+ (and similar supplements) are for reverse osmosis water/distilled water. tap water usually has these things in it.


-shake
In RO and distilled it most definitely is a requirement.
I've always found though that for the rate which we force these plants through their cycles the demands are usually very similar when using tap water in a hydroponic or soilless medium. Some genetics will be able to push through without a cal-mag supplement but many won't, remember also just because you don't see the deficiency... doesn't mean it isn't happening!

Cocogro from Botanicare is pre rinsed with CalMag+
It's a great medium :hippy:
BobBong Reviewed by BobBong on . Over nute or Cal mag? Please Help Hey all, new to this forum. I made a Big Bloom fert mix too strong, I wasnt thinking and normally mix the normal strength in a half gallon, but for some reason I put 4 tablespoons in a pint instead of 2 table spoons in a half gallon (it requires 4 tablespoons in a gallon for reg strength). And the great part is I even water my plant with it, then this problem turned up. Details and Pics to follow. The over nuts happend on the 16th of this month. Set up Not sure when veg cycle starts, Rating: 5