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Hydroponics CANNA ADDITIVES PK 13/14 Plant Nutrients 5L Litre

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PPM going down....

Hydroponics / Aeroponics
PPM going down....
This is my first go at hydroponics. I keep reading about ppm going up in the reservoir, but why does it go down? I though plants drank more water than used nutrients? Should I just add the base nutrients straight to the res to bring them back up?

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