Raven Filter Media Manager, 25 ft (7.6m) Cable, Round Rail Clamp

DescriptionThe Raven Filter Media Manager quickly and accurately measures media expansion during backwash. Achieving proper media filter bed expansion during backwash in gravity filters is a crucial step in maintaining filter performance and longevity. The US EPA recommends 20% to 25% filter bed expansion to adequately clean the filter media (anthracite, sand). Failure to expand the bed sufficiently will result in "mud balls" that degrade the filter's ability to trap dangerous microorganisms such as Cryptosporidium oocysts and Gyardia cysts. How it works: Lower the sensor to rest on the compac