These cartridges are NOT refillable. These devices are sealed and can only be opened by hacking. As for water softening, they are useless! There are water stains on my stainless steel faucet and sink. After the shower, the skin is dry and tense. Forget soft hair! You can watch the movie at the shower door. Do yourself a favor and get better cartridges that cost about $7 more per cartridge. I have no idea how anyone could think they are reusable! For real!
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