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The plain water is 218ppm (hard water). There is a lot of iron in our water, enough where we are changing our water filter weekly because it's so bad.
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That's another issue. If you have hard water you should be using filtered water. RO would be best, but at least some kind of filtered water. Not only will the excess minerals in your tap water (hard water) make your
nutrient solution unbalanced. But certain elements like Iron and Calcium want to bond together when when in excess. When they do, they become unusable to the plants. That's the reason most liquid (if not all) hydroponic
nutrients come in at least two parts. To keep the elements from bonding before their diluted. It's also the reason that the manufactures directions always state to only mix your nutrients in the full volume of water you intend to use. To keep them from being in too high of a concentration where they will bond with each other before their diluted sufficiently.