Pentek 4-1/2" x 9-3/4" NCP Series Non-Cellulose Carbon-Impregnated Pleated Cartridge (NCP-BB) 
Inline Carbon Filters
Fits any housing that uses 2-1/2″ x 9-3/4″ cartridges 2.5 gpm flow rate
Standard 20" Sediment
Nelsen 2-1/2″ x 20″ Melt-Blown Spun Polypropylene 5 micron Cartridge (NP5-20)
Fits any housing that uses 2-1/2″ x 20″ cartridges 8 gpm flow rate
Big Blue 10" Sediment
Nelsen 4-1/2″ x 9-3/4″ Melt-Blown Spun Polypropylene 20 micron Cartridge (NP20-BB-10)
Fits any housing that uses 4-1/2″ x 9-3/4″ cartridges 9 gpm flow rate
Inline Carbon Filters
Pentek 2-1/2″ x 9-3/4″ Dual Purpose Powdered Carbon Cartridge (C1)
Fits any housing that uses 2-1/2″ x 9-3/4″ cartridges 8 gpm flow rate
Inline Carbon Filters
Pentek 2-1/2″ x 9-3/4″ GAC Granular Activated Carbon Cartridge (GAC10)
Fits any housing that uses 2-1/2″ x 9-3/4″ cartridges 2.5 gpm flow rate
Inline Carbon Filters
Pentek 2-1/2″ x 9-3/4″ Coconut Shell Granular Activated Carbon Cartridge (CC-10)
Fits any housing that uses 2-1/2″ x 9-3/4″ cartridges 2.5 gpm flow rate
Inline Carbon Filters
Pentek 2-1/2″ x 9-3/4″ EP Series Carbon Block Cartridge (EP-10)
Fits any housing that uses 2-1/2″ x 9-3/4″ cartridges 4 gpm flow rate
Big Blue 10" Sediment
Nelsen 4-1/2 x 9-3/4 Melt-Blown Spun Polypropylene 1 micron Cartridge (NP1-BB-10)
Fits any housing that uses 4-1/2″ x 9-3/4″ cartridges 9 gpm flow rate
Big Blue 10" Sediment
Nelsen 4-1/2″ x 9-3/4″ Pleated 1 micron Cartridge (NPF-BB-10-1)
Fits any housing that uses 4-1/2″ x 9-3/4″ cartridges 15 gpm flow rate
Big Blue 10" Sediment
Nelsen 4-1/2″ x 9-3/4″ Spun Polypropylene Cord 5 micron Cartridge (N5BB10)
Fits any housing that uses 4-1/2″ x 9-3/4″ cartridges 8 gpm flow rate
Big Blue 10" Sediment
Nelsen 4-1/2″ x 9-3/4″ Spun Polypropylene Cord 10 micron Cartridge (N10BB10)
Fits any housing that uses 4-1/2″ x 9-3/4″ cartridges 8 gpm flow rate
Big Blue 10" Sediment
Nelsen 4-1/2″ x 9-3/4″ Spun Polypropylene Cord 30 micron Cartridge (N30BB10)
Fits any housing that uses 4-1/2″ x 9-3/4″ cartridges 8 gpm flow rate
Big Blue 10" Sediment
Fits any housing that uses 4-1/2″ x 9-3/4″ cartridges 25 gpm flow rate