Residue from making eco/garbage enzymes can be used as fertilizers. The girls are getting the residue out from the bottle. It's not so easy. Takes a shorter time to stuff the peels into the bottles to make enzymes than to get them out. Imagine getting watermelon skin and lemon peels out from the narrow bottle opening. It's kind of yukky looking too but these three girls faithfully help Pn Looi do this job. They usually bury the enzyme pulp.
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