T33 T33 post carbon filter small post carbon filter cartridge filter activated carbon filter large T33 ◆ Material: coconut shell activated carbon sintered UDF / quality coal CTO ◆ Size: 10 inch -40 inch or special specifications ◆ Role: removing water chlorine, chemical pesticides, color, smell, and filtration minor impurities. ◆ replacement time: 4-6 months, depending on the local water quality and water availability. ◆ Compatible Models: for RO water, ultrafiltration water purification machines and other equipment in level 3.