Jimster
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No, as @MIGrampaUSA said, Ph of 7.5 should be fine unles your medium is at that Ph. Most nutes are slightly acidic and everything works out pretty well, especially in soil based grows. To get your PPM reading, there are two measurements to keep in mind. The outflow after a flush will give you an idea of what is remaining in the soil. If you read at the beginning of a flush, you get a better idea of the current root zone conditions before the extra nutes are washed away.My regular water is around 7.5 ph. I bring it down to about 6Ph. In order to get a ppm reading, won’t I have to to flush so I can get run off to test? Again it’s my first grow, so learning as I go.
During growing, the PPM readings can also be used to determine the nutrient levels going into your plants and sort of measure the same thing, but the results during growing help to determine nute dosage, not nute problems (although both are related).