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Four (4) packages of Dog-It replacement foam for Dog-It fountains.
Replacement Foam Filters/Foam Inserts for the Hagen Dog-It Drinking Fountain. One large and one small foam.
Foam Filter and Foam Insert should be replaced every 6 months. More frequent changes may be necessary due to indoor environmental and water conditions, as well as multiple pet use.
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Visit Manufacturer's website: www.hagen.com
Dog-It Fresh and Clear Replacement Foam 4 Pack