I'm just wondering if there is a certain order to put ph up or down and nutes in water? I know the order the nutes go in but does it matter if I put ph up or down in before nutrients or after? Just wondering if it matters Im just over a month into my first grow and I dont want to take any chances.

BTW how long can water with nutes in it last and still be healthy for my plants?

Nutes first, pH second.

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Water, nutes, ph.

If your nutes are colored and you Ph after adding them, won't it affect the color when you compare it to the scale for an accurate Ph reading?

You don't add enough fertliizer to alter the color of your ph sample.