Frequently Asked Questions about RO/DI Filters What is RO/DI? RO/DI stands for Reverse Osmosis and Deionization. The product is a multi-stage water filter, which takes in ordinary tap water and produces highly purified water. Why do I need it? Tap water often contains impurities that can cause problems when added to your aquarium. These may include phosphates, nitrates, chlorine, and various heavy metals. Excessive phosphate and nitrate levels can cause an algae bloom. Copper is often present in tap water due to leaching from pipes and is highly toxic to invertebrates. An RO/DI filter removes practically all of these impurities. How does it work? There are typically four stages in a RO/DI filter: sediment filter, carbon block, reverse osmosis membrane, and deionization resin. If there are less than four stages, something was left out (typically, the DI stage). If there are more, something was duplicated. The sediment filter, typically a foam block, removes particles from the water. Its purpose is to prevent clogging of the carbon block and RO membrane. Good sediment filters will remove particles down to one micron or smaller. LiquaGen does not distribute or sell products to any 3rd party sellers on . This product is sold exclusively on LiquGen’s store. Other companies selling this product are counterfeits. Please make sure to purchase a genuine LiquaGen product for proper authenticity and warranty.
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