Carbon Filters include a 20 micron post filter to remove fine suspended particles such as carbon fines. After installing a new cartridge, it is recommended to pass 5 gallons of tap water through to flush out any carbon fines present in unit.
Sediment Filters are made of 100% polypropylene, 5 micron to reduce extra fine dirt, sand, sediment, silt, rust & scale. They are resistant to bacteria, corrosion, & chemicals.
The BB Dual Gradient Filters also have an added 50 micron pre-filter layer to reduce fine sediment and improve the performance of the filters.