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

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Why do we de-chlorinate water, just to re-add chlorine to sterilize the res?

Hey guys, I've been thinking about this and it's bothering me lol. Is it different chlorine that they add at the city water supply? Is it the concentration? Or do we not need to de-chlorinate in hydro?


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