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Settling Solutions

A note or warning to anyone keeping hydroponics solutions. After a 6 month hiatus, I have started another crop of hydroponics Tom Thumb tomatoes. I noticed the solution contained crystals at the bottom of the container that would not re-dissolve by shaking. I don’t know whether heating the solution will re-dissolve the minerals without changing the chemical makeup. I'm going to take the lazy-assed approach and buy more solution and make sure I shake it up periodically so it doesn't settle; at least until I put a large enough setup together where I will start mixing my own chemicals.