Doug Martin said: "I live in an area with lousy water and I'm raising cichlids so I'm using the Tap Water Filter." 1. What's in your "lousy water"? Do you know the contaminants and their levels? 2. Is it safe to drink, out of the tap? 3. What are you trying to remove by using the deionizer? 4. What kind of cichlids are your raising? James Purchase Toronto