10" x 4 5/8" Sediment Poly-ester Filter rated 50 micron.
This is the official Pentek R50-BB, which is also sold under American Plumber W50PEHD Heavy Duty Pleated Polyester Cartridge, designed to filter coarse sand, rust, and scale particles.
The filter is washable and re-usable, ideal for well water that has sand or other solid sediments.

Cross references with Part Number R50-BB, R50BBS, R50-BBSa, W50PEHD, and part number 155053.


Replacement cartridge used in Big Blue Housing.

Sold under many different Brand Names.
Such as;
Pentek / Ametek / Culligan / Kleen Plus / Plymouth Products / Pentair / American Plumber / Bruner / US Filter
Housings sold separately.