Distilled water is the way to go. Every time I water I mix up a cocktail which consists of six different ingredients; I can be certain that my product hasn't deviated much in terms of pH and EC (fertilizers & root enzymes). This would not be the case if I were to use my tap water. Tap water frequently has salts, sulfur, chlorine and iron in it. However, you can put tap water in a bucket or a dish and let it sit for a day and many of these ions leave.
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