Users will test their urine before the reaction. Then, they will add an enzyme, wait for their urine to hydrolyze, and then add Magnesium Chloride. A sediment will build up at the bottom of the jar. Using a filter, they will pour off and flush the liquid, leaving the fertilizer in the jar. They can add water and the seeds included in the kit to grow their own watercress hydroponically in the glass container used for the reaction.
All products linked here have been independently selected by our editors. We may earn a commission on purchases, as described in our affiliate policy.