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I have an under-sink RO/DI system, the whole system was about $200. It's a great investment for a place with hard water. I use it to get demineralized water for

I have an under-sink RO/DI system, the whole system was about $200. It's a great investment for a place with hard water. I use it to get demineralized water for my house plants, fish tank, and drinking. I use the RODI for expensive steam appliances like my Wagner, but I don't use RODI for regular old vegetable steamers or humidifiers. It's just not worth it. The scale buildup isn't a big deal and it's very easy to dissolve with an acid or just brush off.

dragontamer 6y ago
For people with Ultrasonic humidifiers (which spray the scale across the room as white-dust), it is a much bigger pain to clean that up with regular dusting. For warm-air humidifiers (aka: boiling water), where all the scale is concentrated onto the heating element: yeah... no big deal. A cup of cheap 5% vinegar and 20-minutes of waiting is all you need to clean that off. ------------ I think if you have RO water, it probably makes sense to use an ultrasonic humidifier.