The ideal water filter for PearlCo unimax, Brita® Maxtra®, and many other Maxtra® compatible filter cartridges. The PearlCo water filter Astra is made of high-quality, durable plastic. A practical, easily adjustable change indicator with date and month information shows at a glance when a new filter cartridge is needed. Despite its high capacity, the Astra water filter fits in many refrigerator doors. Its ergonomic shape ensures comfortable, easy handling. The non-slip design of the base plate guarantees a stable and secure stand.