All of the Hydrologic reverse osmosis and de-chlorinator units use these new earth friendly filters. This high performance coconut shell carbon is manufactured using a patented process that reduces harmful green house gas emmisions. 

Green block filters are made using high performance coconut shell green carbon having more micro pores compared to other types of carbon and a unique binder system delivering a product with superior absorption capacity and kinetic dynamics. This filter out performs any filter on the market and is also good for the earth!