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Water softening
Blue,
I also have some experience with water treatment and softening. I expect that you are most worried about the increased amount of sodium from the water softener. That is because the water softener chemistry converts calcium carbonate to sodium carbonate, in most systems.
The solution is simple and I use this method personally. You can buy Potassium Chloride salt for your water softener. Potassium Chloride will regenerate any typical ion exchange resin water softener. It is a bit more expensive than sodium chloride but the potassium ions will not have a detrimental effect on your blood pressure or other physiological functions.
In most cases, it does not make any difference, as the amount of sodium intake from drinking softened water is very low, but if it worries you, potassium chloride is for you. Most home centers or water softener supply places will carry potassium chloride for water softeners.
I put in a high efficiency GE water softener in my current house and the salt usage is much, much lower. If I fill the tank on my system (200#), I don't have to look at it again for another six months. Some other more old fashioned systems can use more than one hundred pounds of salt per month.
As far as making calcium carbonate neutral...the only way that I know of doing that chemically is to cause a reaction to make it into a solid (limestone) and then filter it out mechanically. I don't think that this is very practical for a home water softener. Reverse Osmosis systems do something similar to this and they have to backwash the filter to remove the calcium carbonate contamination. A typical undersink RO system will only make about five gallons of pure water per day.
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Water softening
I went a step further. I have a connection to the US patent database, so I took a look at the patent on the website that you linked to. The patent is for a torturous flow path mixing sytem. It does not have anything to do with water softening.
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