Save money and purchase a full case of carbon block filters.  25 filters per case.

Activated Carbon Block Filter - 5 micron - 2.75" x 10" 

PCTO/2 carbon block filters are used worldwide as a cost effective filter for removing free chlorine. Every carbon block is made from coconut shell, palm or nut shell, and coal based carbons. Because of the unique pore structure of this carbon block, it is well suited for chemical adsorption. This includes VOC’s, while reducing chlorine and chemicals that result in taste and color issues. The extrusion process allows the production of a carbon block with more carbon and a low pressure drop. The service life of this carbon blocks is greatly extended by an outer layer of 5 mic polypropyleneno-woven pre filtration media. This creates what many say is a sweeter, better tasting water.

• 5 uM, nominal filtration rating
• Performance tested & verified by independent labaoratory testing
• Chlorine, taste, and odor reduction
• Operational Pressure / Temp / Service Life: 125 PSI / 100°F (38°C) / 1 GPM for 2000 gal
• No release of carbon fines
• Flush for five minutes prior to use
• Do not use where the water is microbiologically unsafe or of unknown quality