Reverse Osmosis   Stage 1 - Pre filtration The purifying process begins with a sediment reduction cartridge that traps dirt, rust, mud, hairs and other particles that can affect the taste and appearance of water. This stage also protects the RO membrane from fouling and abrasion.   Stage 2 - Membrane Process This is the primary component of “Raindance” RO purifiers and features the latest technology membrane that can separate up to 98% of dissolved metals and salts from ordinary tap water. Raindance RO membranes are capable of rejecting ionic contaminants down to five angstroms in size. One angstrom is one ten millionth the size of a millimetre.   Stage 3 - Contaminant Rejection System Another unique feature of RO membranes is that they are mostly self cleaning. Your Raindance purifier has been designed and constructed by skilled specialists and the RO process will reject and flush down the drain the contaminants that would otherwise enter your body.   Stage 4 - Reduction of Volatile Organic Contaminants While the RO process will reject incredibly small contaminants, it must at the same time be sufficiently permeable to allow hydrogen and oxygen to pass through. As a result, some gaseous and low molecular weight chemicals and cancer causing compounds such as chloroform pass through the membrane. These potentially dangerous contaminants are effectively reduced by the Raindance bacteriostatic chemical reduction and water polishing final filter carbon cartridge.       Contact All About Water For more information about the Raindance Reverse Osmosis and replacement filters and parts.