Allxin Cat Water Fountain Replacement Filter, 4inch, with pre-filter sponges

Inside every Allxin cat water fountain filter cartridge, three materials are layered: activated carbon, an ion exchange resin, and cotton. The cartridge measures about 4 inches long and 4 inches wide, with a thickness of about 0.5 inches. The set is intended for 67oz, 95oz and 135oz cat and dog water fountains and dispensers, and the pre-filter sponges that come with it measure 1.5 × 1.1 × 1 inch.

Soaking and rinsing a filter before it goes in

Before a cartridge goes into the fountain, Allxin directs that it be soaked in water for 2 minutes. The cartridge is then rinsed thoroughly under running water.

What each cartridge and sponge brings to the fountain

• The filter body is about 4 inches by 4 inches, so it matches fountain trays built around that footprint.
• Cotton, activated carbon and an ion exchange resin are combined within the same cartridge.
• The pre-filter sponges measure 1.5 × 1.1 × 1 inch and sit in front of the cartridge.
• The 16-pack holds 32 pieces in total, counting cartridges and sponges together.

Does this filter fit your fountain?

Start with the fountain size: Allxin lists the 67oz, 95oz and 135oz cat and dog fountains and dispensers as the ones these cartridges are made for. Next, measure the filter slot, since a cartridge of about 4 x 4 x 0.5 inches only drops into a tray of that size. The sponges are separate pieces at 1.5 × 1.1 × 1 inch, so check the sponge compartment as well. A fountain outside those three capacities is not covered by the Allxin compatibility list.

How often to swap a cartridge

Allxin advises changing the cartridge every 2–4 weeks. How often your pet drinks from the fountain, and how many pets share it, decide where in that range you land. The resistance of the cartridge is the ion exchange resin, so the cartridge itself is the part that gets swapped, not a refillable core.

Questions about the cat water fountain filter

How many filters and sponges come in the pack?

The unit count is 32, which covers the cartridges and pre-filter sponges together in the 16-pack.

What size are the filters?

Each cartridge is about 4 inches long, 4 inches wide and 0.5 inches thick.

Which fountains does it fit?

Allxin lists 67oz, 95oz and 135oz cat and dog water fountains and dispensers as compatible.

How long does one cartridge stay in the fountain?

Allxin gives 2–4 weeks, with drinking frequency and the number of pets deciding where in that range it falls.

Do I need to rinse the filter first?

Yes. Before use, leave it in water for 2 minutes, and afterwards give it a thorough rinse with running water.

What is inside the cartridge?

Activated carbon, an ion exchange resin, and a cotton layer are layered within each cartridge.