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A pet fountain that has slowed to a trickle almost always has the same problem: calcium scale on the pump impeller and inside the tubing. Tablets rinse loose residue off the surface. They do not give you the contact time that actually breaks mineral buildup down.
This is a liquid concentrate. One teaspoon in 32 oz of warm water gives you a soak that reaches a low enough pH to dissolve hard-water calcium over 20 to 60 minutes, with no scrubbing. Three ingredients, unscented, and up to 47 cleanings per 8 oz bottle.
Rinse thoroughly before returning the fountain to your pet.
Please note the following important information about this product from Think Crucial: (i) it is an independent third-party product, NOT an Original Equipment Manufacturer (OEM) product from Drinkwell®, PetSafe®, Catit®, Pioneer Pet®, PETLIBRO® or any other brand named on this page; (ii) because it is not an OEM product, it is not covered by any guarantee or warranty from those manufacturers; (iii) use of this product may violate or void a manufacturer's guarantee or warranty - it is entirely your responsibility to check, and entirely your risk if you decide to use this product; (iv) we do not guarantee or warrant compatibility with any product from those manufacturers. Please check your manufacturer's warranty with regard to the use of non-OEM products. All brand names and trademarks referenced belong to their respective owners and are used here only to explain the compatibility of this independent product. Always follow your appliance manufacturer's own cleaning and descaling instructions.