We have very hard water and haven't had water for a while. Untreated tap water is not suitable, and since I pump 5 gallons of water through ultrasonic humidifiers daily, purchasing distilled water was impractical. Those little cartridges really don't help much. I didn't get many tanks (we have very hard city water) but they helped a lot until a new water filter came along. They work and are safe as I use them in humidifiers in a special room for reptiles (snakes). I would buy again.
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