Aries BB Nitrate Selective Filter Cartridge ( AF-20-3610-BB ) Size 4.5″x20″
Manufactured By :Aries FilterWorks, a division of ResinTech®. Compatibility :Fits standard 20" x 4.5" Big Blue filter housings. WQA Gold Seal. Construction :Sonic-welded ABS body and cap. Temperature Range :40°F to 100°F.