AquaStyle 850 Filter Service Kit

Fit a new pack of Aqua One 4c and the Aqua One 4s when you receive the kit. After this replace both the Aqua One 4c cartridges every six weeks or so and gently rinse the Aqua One 4s in a little aquarium water (it doesnt have to be pristine) to preserve the helpful filtration bacteria that grow in the sponge pores. The Bionoodles can also be rinsed in the same way. Though these only need to be replaced every year or so. A few at a time is best.