CTO CTO sintered carbon activated carbon filter efficiently carbide rod filter cartridge ◆ Material: coconut shell activated carbon sintered UDF / quality coal CTO ◆ Size: 10 inch -40 inch or special specifications ◆ role: to remove chlorine water, chemical pesticides, iso color, odor, 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.