Check the listing for details. UltraClear? 100% Bentonite Koi Clay by ABI Inc. - 4lb Container. Condition: New. Listed at 42.49 USD. UltraClear® Koi Clay benefits your Koi & pond fish by providing trace minerals, absorbing toxins, and maintaining an ideal habitat on the pond bottom for Koi to thrive and flourish.Trace minerals including calcium, magnesium and other trace elements for improved bone and scale growth and blood clottingSilica in Bentonite clay binds to and removes harmful toxins, pesticides and heavy metalsMaintains a clear, high quality water environment for Koi or goldfishApplication Instructions Two tablespoons treats 1000 gallons per week. Increase frequency if problems persist or load increases. Apply by either mixing dosage into a gallon of water and distributing throughout pond, coating fish food prior to feeding, or adding enough water to roll into balls that can then be dropped into the water.