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Wastei
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It's for keeping the solution sterile and stable. Oxidizers like H2O2(hydrogen peroxide) and Bleach(sodium hypochlorite) is commonly used to keep a nutrient solution stable when growing with traditional salt based nutrients. I like bleach since it's safer to use and has longer residual sterilizing effect. H2O2 last 6-12 hours while bleach keep having effect for days. Application rate is lower, more effective and safer to use compared to H2O2. It's also dirt cheap and accessible in any supermarket.What do you add bleach to your water for? I never heard of this
I also add chlorine since it's a tertiary nutrient in Cannabis and in right concentrations the plant make good use of it. You can see it very clearly when adding in DWC. The leaves perk up, phototropism increases slightly but most important of all it helps the plant combat pathogens.