Fishface,
The only series from Aquasafe that doesn't come with a DI chamber is the Aquahome. His Aquarium, Aquasafe, and Maximus models all come with DI. Some DI chambers are transparent, some are not, but both are DI. If you're not mounting this as a dedicated auto top off system, the water tank is useful when you need a few gallons on hand really fast or if you intend to use this for drinking as well. You just cannot drink from this unit if it's part of your auto top-off plumbing. If 10-20 dollars is not a big deal to you, just get the ro + di units. I've actually never seen anyone with a salt tank who doesn't want DI. I don't think running RO only can get you an absolute zero TDS reading.
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George
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