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Gley

Gley is another material useful for sealing ponds. Gley is produced by spreading a six to nine inch layer of very fresh, green manure over the area to be sealed. The manure is then covered with plastic, cardboard, or anything else that prevents oxygen from reaching the manure so that it will ferment anaerobically. The fermentation produces a bacterial slime in one to two weeks that can permanently seal soils. After two weeks the plastic or other covering can be removed and the pond can be filled with water.