With the Hydra Rainmaster Duo two stage filter, any facility that harvests rainwater can purify rainwater and repurpose it for utility. The first stage filter includes a stainless-steel net cartridge of 90 microns, and the second stage includes finer filtration with activated carbon or carbon blocks. The filters are available with ½“, ¾“, 1” in/out connection in BSP or NPT brass and plastic thread.