Ca/Mg is not always necessary when using tap water, nor does it usually cause problems. Good nutes contain enough Ca/Mg for most applications when using good tap water. However, cannabis can sometimes use more than available and/or tap water is low on micronutes. Usually Mg not Ca.hi..
about cal/mag:
Can use it with tap water? then I correct the ph ..
I always use it or alternating with water?
I can mix it with other nutrients?
which cal / mag advise me?
plants have preflowers but remain small and do not grow!
thanks