Aquasana Rhino EQ-304 Pack of 4 Pre-Filters for the Aquasana Rhino EQ300 Whole House Water Filters.

The sediment pre-filter is used to prevent dirt and sediment particles from entering and clogging the main filter unit. This cartridge should be replaced every 3-6 months depending on water quality and sediment levels. Change when colour darkens or water flow slows.