All come in 3 pieces per set except the sponge filter 2 pieces per set

Replacement pet fountain filters for use with Drinkwell Pet Fountains
Quick change filters capture debris and filter water to keep it clean and fresh for your pet
Replacement Drinkwell fountain filters available in assorted quantities

Instructions
Remove the housing cover and insert the filter cartridge down into the well in the housing. It fits in the well diagonally. The bottom of the filter is more narrow than the top and the black side faces outward (toward the spout). If the fit is too tight, it is either in upside down or in the wrong groove at the front (move it back one groove). Rinsing the filter before use will help remove any loose bits of charcoal, which are harmless.

Filter should be changed approximately every six to eight weeks.

Item Code: DWF01

( Mini Fountain/Original Fountain/Platinum Fountain/ Big Dog Fountain)

Item Code: DWF02

( Mini Fountain/Original Fountain/Platinum Fountain/ Big Dog Fountain)

Item Code: DWF03

(360 Plastic Fountain/360 Stainless Steel) Fountain

Item Code: DWF04

Sponge Filter only change every 2-3 mths

(360 Plastic Fountain/360 Stainless Steel Fountain)