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I have a sunleaves tds expert, and it has 3 different settings to use when testing ppm: KCI, 442, and NaCl. Which one should I be using when checking ppm?

Im vegging my little ones right now, and was wondering if it is ok to mix the advanced a and b nutes, compost tea, hygrozime, and liquid karma all together before i put it in the res? It would make it easier to do it that way, but being that they are all super concentrated, i dont want them to...