Filter size is 2.75*1.65 in. The package contains 4 filters and 4 sponges, enough for more than two months.

The Activated carbon for filtering hair and residue, removes odors and impurities, which can soft water, getting better water tasting.

Sponge filter for capturing hair and debris, keep water tasting fresh and clean all the time.

To make sure your pet gets enough fresh water, change the activated carbon and sponge every two to three weeks.