this post was submitted on 22 Sep 2026
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Under-sink and showerhead units.
Are you thinking water heater or filter? Because I've never seen a water softener that can fit under a sink or on a showerhead. Unless you're talking about phosphate feeder cartridges but those don't actually soften water they just help keep limescale from sticking.
https://www.homedepot.com/p/Lukvuzo-Heavy-Duty-No-BS-Removable-Shower-Head-Filter-for-Hard-Water-Chlorine-Water-Softener-Shower-Head-Filter-1-Pack-HSPH007FS089/330537478
Can't speak to how well it works, I just know it exists.