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Keystone Filter patent pending line of 222 Giant® Industrial Filter Housings and Cartridges offer sub-micronic filtration in a low cost, high surface area configuration, with unique double 222 o-ring seal to ensure integrity and safety.

The first housing of its kind, the 222 Giant® is available in all-polypropylene construction for cleanliness and broad chemical resistance or with clear SAN bowls in both 10" and 20" sizes. The housings are designed to fit Keystone's unique line of 222 pleated polypropylene filter cartridges that are available in 0.2, 0.45, 1.0 and 5.0 nominal micron ratings.

A new Key-Cyst™ Filter, which also utilizes the GIANT® 222 style housing and cartridges, is in the process of being registered with NSF for cyst protection, and is being used by beverage bottling companies to protect their water from Giardia and Cryptosporidium cysts.