CRY™ is an aggressive variant of CRX™. Elementally, CRY™ has about 1.5X the embedded silica content when compared to CRX™. CRX-Y. A finer media for medium flow and high pressure systems. The smaller granules help mitigate channeling and improve color refinement in systems running under higher pressures. Designed for operators who prefer the traditional powder form or want to maintain a higher PSI.