Definition: Deionizer is a device for filtering water that uses several ion exchange resins to purify and remove impurities from the water. Deionized water is often used in aquariums to lower the hardness and/or pH.
deionizer
By Shirlie Sharpe, About.com
Suggested Reading
Explore Freshwater Aquariums
Must Reads
About.com Special Features
Home Allergy Center
Banish mess, reduce allergens, and maintain a clean, healthy home. More >
Home Improvements Made Easy
Inspirational ideas and expert tips to help you pull off your next DIY project. More >
©2009 About.com, a part of The New York Times Company.
All rights reserved.