BlocZanswered grow question 10 days ago If you have a water softener, it may be best to mix 50% of it with unsoftened water. Water that is low in minerals is not good for plants and does not react in the same way with fertilizers, in terms of pH and EC.
After that, if you want to give it calcium and natural magnesium, it is available in quantity in clay. By adding some to your potting soil, the plant will take it when necessary 😉👍