Not sure if you’re in a position to collect rain water but if so it far better than any tap water ,, but sometimes you have to do what you have to do I understand that…

First thing to do is find out about where the pH and EC/PPM buffer of the soil is with a quick run off test using RO/distilled water. RO has no pH or mineral buffer. The run off will give a little more accurate result. A decent test is to use about an equal volume of water to media and then check the run off numbers. If pH and/or PPM are out…

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Every watering.