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is a naturally occurring calcium bentonite clay, which is available from only a few of the bentonite mines in the world. It dissolves well and is ideally suited for recirculating koi and garden ponds. 100% all natural. It contains a balance of minerals in their natural colloidal form, making them easily assimilated. They enhance the production of enzymes in all living organisms, improve water quality and removes toxins from pond water. They benefit both plants and fish as well as the "good" bacteria living in your filters.