RO DI unit
In researching RO/DI units I came across this page from About.com.
Say what you want about this site, I have found thier information to be very good and thier writers know what they are writing about.
RO/DI units take your tap water and clean it to be free of any nitrates, phosphates and other baddies before you use the water in your tank.
RO-DI stands for reverse osmosis /deionization and is actually 2 processes. The units come in several models or stages. Some only RO, some only DI but you can get filters that will do both and prices range anywhere from around $100 for a simple RO unit (or this one on sale at Drs. Foster Smith) to several hundred dollars for a unit that will even do your toast in the morning.
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