Cartridges for Filters Housings “Big Blue 10” and "20" Working Under Pressure Housings for filters "Big Blue 10" and "20" are distributed all over the world. However the cartridges for these filters do not have the HRCM filling. The Holding 'Zolotaya Formula' manufactures cartridges with the HRCM filling compatible with typical housings of "Big Blue 10" and "20". These filters can be used for the purification of drinking water in the kitchen, bathroom, café, school, and kindergarten.