No Salt Systems for Water Softening

I see ads for "No Salt" needed water conditioners. 
How do they work without using salt?

1. Many dealers will advertise a no salt water conditioner. Any brand of water conditioner can be operated without using salt. This is done by using a salt substitute, potassium chloride. It generally cost twice as much as regular salt ( sodium chloride ), and can be difficult to find in some areas. Also, it is recommend to increase the salt setting on your control valve by about 10 % , when using a salt substitute. This is because it is not as efficient in provided the needed negative ions to the resin beads as regular salt.

2. Some companies offer catalytic filters and/or magnetic devices to soften your water that do not use salt, or anything else to regenerate their product. Buyer beware! If a technology had been developed that could replace a resin based water conditioner, then everyone would be selling it. I know I would. Those salt bags are heavy :)

For more detials, I'd recommend this webpage written by a retired chemist. http://www.chem1.com/CQ/