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Banana peels make the best compost, with lots of potassium. The best compost is a mix of composted wood, kitchen scraps, peat, and leaves. The nutrient levels are also high like in manure. You need to cut the nutrient levels with sand and maybe a little clay.
 

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Give your RO water a try. Your tap water might be high in heavy metals that could cause anaerobic conditions so the RO will take the metals out.

Oh, don't forget to add extra calcium & magnesium for your plants in the RO water.
 

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I don’t know how effective charcoal is at capturing carbon in the soil. You can build a CO2 capturing device where air has to flow through the charcoal And when you need to release the CO2, you apply heat to the charcoal.

its high CEC should be great to work with.
 
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