Water for Water Changes

[Rikko]

I've just started using one of the Aquarium Pharmaceuticals "Tap Water Purifiers".. It's strictly a DI unit but works well. The only obvious downfall to DI only is resin fatigue.. Some people in the UK reported they got 17 gallons (!!) of water before it was worn out. When our tap water in the Vancouver area reads around 10 ppm TDS, the cartridge goes a lot farther.