Selection of site-building pools for leech breeding

Select the area facing south and back, and shelter from the wind to the sunny place. As a sideline, it can also be cultivated in Kou Pak Tin, Dianchi or rice fields. Small-scale farming can build concrete pools, which are irrigated with water and vinegar and urea after soaking for about 1 month until the walls of the pond are covered with moss. After being flushed, it can be used after clearing the basin containing alkalis.

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