said by jjoshua:Agree....
There is no way that you're getting a water softener that fits under your sink.
A real water softener is plumbed to your main water line and softens everything. It has a brine tank that you fill with salt to keep it working, not some mystery cleaning products.
You can get a reverse osmosis filter for under the sink which may help with water quality but these sell for a fraction of the price that you were quoted.
Sounds like a scam.