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tap water usually has plenty in it. depends on your soil, but probably not unless you have issues. I added it out of curiosity but didn't notice any difference so I stopped using it. my tap water is at 150ppm and is fine without it in hydro (coco, drip feed). I still have the bottle so every once and awhile in early development I'll give it a dose, but as soon as the bottle is gone I probably go without.
-------------------- Any help given is for educational purposes only. Its your responsibility not to break any applicable laws Bamboo Bongs I make | Perfect Dry and Cure | Grapegod under LED “Human beings, vegetables, or cosmic dust, we all dance to a mysterious tune intoned in the distance by an invisible player.” ~ Albert Einstein