Puretec DP10MP1 10 Micron Dual Purpose Carbon Water Filter Cartridge 4.5" x 10" are constructed from a carbon impregnated non cellulose media. They offer sediment filtration, as well as taste, odour and chlorine taste, and odour reduction in one cartridge. Unlike cellulose cartridges, DP Series cartridges are resistant to bacterial attack allowing them to be used for non chlorinated water applications. Puretec DP Series cartridges are ideal for rainwater tanks, bores, whole house, polishing filters on reverse osmosis machine, drinking water and many other applications. Pleats provide an additional surface area for high dirt loading capacity, while maintaining minimal pressure drop. This combination of pleated polyester media and carbon filtration produces an outstanding filter cartridge with extended service life.