For Municipal Mains water that is treated with Chlorine (Not Chloramine), standard CTO Carbon filters are the best suited cartridges. They are economically priced being a base model type filter but are effective at removing free chlorine from drinking water. The H1-46CTOP Twin Undersink System is designed for just that, Chlorine Removal. The premium range CTOP 2510-P5 cartridge is designed with high capacity and absorbency in mind and can treat 150% more chlorine than standard CTO filters on the market. As the name suggests, the CTOP range of filters is the superior premium upgrade to the standard CTO filters and it is recommended for families who consume medium to high quantities of drinking water and also use the water for cooking and other things like aquariums. The higher capacity ensures that the filters will go the distance and not fall short causing replacements to be more frequent.