$58.99 5 Micron Carbon Block CTO Coconut Shell Water Filter Cartridge 10 Standard NSF | eBay
Pentek 155312, CBC20-BB Carbon Block Filter, 0.5 Micron, 4.5 x 20 | Serv-A-Pure
China 5 Micron Activated Carbon Block Filter Cartridge Manufacturers, Suppliers - Factory Direct 
