A friend recently told me about his situation, very similar, while very low EC Tapwater sounds like fantastic news, especially in a place where most have to use RO as the tap is undrinkable...
But, it appears that most nutrients are made for waters with more Calcium, so he adds CalMag and since has no problems.
But, it appears that most nutrients are made for waters with more Calcium, so he adds CalMag and since has no problems.