Fluval Foam Filter Blocks for FX Series - 3 pk Apple Inside the pet sling is

Inside the pet sling is a protective leash or harness connector for added security and safety

Made with protein-rich animal ingredients plus fruits

Designed to polish aquarium water in the last stage of filtration

These Onesies for Dogs are Available in Multiple Colors and Sizes

Fluval Foam Filter Blocks for FX Series - 3 pk Apple Inside the pet sling isFluval Foam Filter Blocks are designed for use with Fluval FX Series Filter models, including the FX4, FX5, and FX6. The custom fit blocks feature a snug fit to prevent bypass for more complete filtration. The foam filters have a pore size that allows efficient water flow with less clogging for improved performance and a longer life. The foam inserts also enhance biological filtration by providing an ideal medium for the growth of beneficial bacteria,