A complete reactor media containing not only calcium and carbonate, but essential trace elements as well.  In fact, ARM has nearly 50 times the strontium of other brands (7390 ppm).  ARM is processed for immediate use wit no rinsing required, and has double the surface area of regular aragonite. 

This media works with Tunze, Precision Marine, Korallin, Coralife, Knop, Coral Vue, Vorex, Octupus and Pacific Coast brand calcium reactors.