The NeoPure 2.5" x 10" Depth Sediment Filter is designed to serve as a reliable and economical pre-filtration solution for both saltwater and freshwater aquariums, effectively removing sediment particles from water before it passes through more sensitive filtration stages. This filter features high-efficiency polypropylene technology with graded density, allowing it to capture dirt and debris at various sizes down to 1 micron and 5 microns, ensuring clean and clear water for your aquatic life. For optimal performance, we recommend changing the sediment filter when visual signs of contamination are noticed or a drop in pressure is detected.