John from Halifax wrote in asking about replacing his salt based water softener with an electronic water softener to make it easier to water his lawn.
Ion-exchange with salt will soften water
Most of our water softeners add salt to the water in a process called ion exchange. This actually changes the chemistry of the water, changing the harsh minerals in the water, usually calcium, from affecting the way that soap acts to get things clean. Softened water is easier on the skin, but hard on plants because of the salt. Most people will install a cold water by-pass to provide untreated cooking water, drinking water and even the outdoors hose bib. That simply requires tapping off some water before the connection to the water softener.
Others use an alternative scheme and only soften the water heading to the hot water tank, leaving all the cold water in the house untreated. If you always clean with at least some hot water, that works fine, uses less salt and does not affect the plants.
But John was asking about electronic water softeners. Are they real?
Magnets can prevent calcium deposits
There is a long standing and well proven technology of submitting water to very large magnetic fields by running the water through special magnets. This does not change the chemistry of the water at all, but simply stimulates the mineral molecules so that they remain in suspension for about 72 hours, meaning that they won't stick to anything as calcium usually does, and by 72 hours the water has gone through your house. Water with calcium in suspension is considered "soft water" and allows soaps to act normally. Industrial sized magnetic conditioners will actually cause old accumulations of calcium to come loose and end up cleaning out the system. The problem is that most magnetic softeners made for the domestic market are far too small, and those that are large enough, like the one I showed on the show, didn't make it commercially because they tended to plug up often. These smaller magnets had to slow down the water while it was in the magnetic field so they had very small passageways which plugged up. Commercial ones work because they are simply very much larger. A couple of little magnets strapped onto a pipe are useless gadgets. So the technology is good, but its application to a home is problematic.
Electo-Magnetic devices do not block water flow
Electronic water softeners are actually breaking into the residential market with some legitimate products because they can create a strong electro-magnetic field without restricting the flow of water. The one shown above is called Clear Wave made by Field Controls Inc. Another credible model is called ScaleBlaster from ClearWater Enviro. The red antennas create a strong magnetic field of varying frequency over several inches of water flow. It is not the strongest of water softeners but it is economical. One catch is that if there is a lot of iron in your water, none of the magnetic or electronic softeners will work well. You always need to test your water before choosing any water treatment or filtration device. I put the Clear Wave on my own water supply. It did not clean out my shower head of calcium accumulation as I had hoped, but when I did clean the shower head myself and re-install it, it has been 2 years and there is no new accumulation.
Aside from long term observation, how do you tell if a system works on hard water? Take separate water bottles and put a small measured amount of soap into each. Half fill one with untreated water, as in the centre bottle above, and shake. The bottle on the left is the same water softened by ion exchange, making about twice as much suds when shaken. The third is filled about 3 days after installing the Clear Wave, giving suds someplace in-between the hard water and the regular water softener. You want to wait three days because it can take water up to 72 hours for water to flow through your house, and you want to be sure the water you are testing has gone through the device you want to test. So the Clear Wave is not doing the same job as a salt based water softener with this homeowner's water supply although it is definitely softening the water, but there are no continuing salt costs, no maintenance and no problems watering the lawn. That would be a judgment call as to whether it was doing good enough to replace the ion exchange machine. This homeowner decided to go back to salt.
What magnets will NOT do
One caution: magnetic systems will not remove iron or any impurities. They are not filter systems. They do not add anything to the water -- like salt that can cause problems with plants or with down stream water systems. They only put whatever calcium is already in your water supply into suspension long enough for it to get used or flushed through your house. Theyd don't make "soft water" with that slippery sensation in the shower common with ion-exchange systems, but if strong enough, they can eliminate or reduce your "hard water".
Test your water to know what you need to accomplish
Bottom line? Magnetic and electronic water conditioning can be legitimate if the mineral composition of your water is appropriate for their use and the units are sized for your water flow. Actually, in industry they often treat the water with magnets before sending it through an ion exchange unit, the end result being the soft water they want with far less use of salt. But the water softening industry doesn't want to encourage lower continuing revenue, so they don't size their residential units to work in tandem with magnetic or electro-magnetic systems.
I am sorry that I know of no objective listing of just which systems would work well with different types of water, or a rating of which work better than others, or even a good listing of what is available, although stories I have received indicate that price does appear to have a bearing on the strength and effectiveness of the magnetic field.