Guys, I've seen stuff like for years and always sort of grimace.
Suffice it to say that I'm a a licensed engineer, who actuallly works for a water purufication/softening company, one of the largest in the world, and deal with this stuff every day. I'm not going to use this post as an endorsement for my company, but I'd like to clear up a few misconceptions.
First of all when people talk about "hard" water, they're usually referring to dissolved limestone. (There are other things too, such as various forms of iron but for this post we'll focus on the more common)
When limestone dissolves in your water (underground, then you pump it up) it becomes calcium carbonate and calcium and magnesium sulfate.
The calcium carbonate is the white grit that we're all familiar with. It's what ruins your family's water appliances. Faucets, shower heads, water heaters, and you'll see it in your ice dispenser tray if you've got one on your refrigerator door.
The calcium sulfate, however, behave completely differently because it reacts chemically with your soap products, and forms that soap scum you see on your bathtub walls. The problem is that you also leave it on your skin. That's what gives so many people dry skin. When people say "squeaky clean" they really don't understand that that is not clean. It's the grip that the scum leaves on your skin.
Now when you have a water softener, you REMOVE those compounds (actually you trade the ions of either sodium or potassium chloride for them when you backwash the softener) That's why with a properly functioning softener, you won't see that buildup in your appliances, and you'll actually feel like you CAN'T get the soap off. That's actually a good thing. What you're feeling are your own natural skin oils softening your skin. I know it drives some people nuts, because they swear the soap's not coming off, but trust me, it's not soap
Now, I've personally tested 5 differnt "magnetic" systems in our labs, just for fun, and I've noticed a few things. None of the systems that we tested worked, and NONE of them had seals of approval from the NSF or WQA (water quality association).
They don't claim to "soften the water". They claim, from what I've seen, to be able to magnetically " align" the domains in the calcium so that it doesn't stick to appliances. Well, that may be, but I doubt it, and if you guys who have them are seeing limestone deposits on your sinks and faucets, then that would seem to prove that they're not working.
Now, emprically, I have run TDS (total dissolved solids) tests on the water going into those systems, and the water coming out, and I can assure you, that it is exactly the same coming out as going in.
If the water was 10 grains (171.1ppm) going in, then it was still 10 grains coming out.
I'd like to point out, in fairness, that I've never cut open any piping to see if those systems are actually preventing buildup, so I can't say. If they are, the good and well, but they would still be better suited to say, an industrial application than a residential because if they're not REMOVING the calcium carbonate and especially the calcium sulfate, then you'll still have soap scum forming on your tubs, skin and hair, and your wife will probably have the same dry skin problems. In other words, they may be able to prevent buildup inside plumbing (I personally would like to see some sort of independent, licensed testing proving this, and an accurate engineering explanation of how), but they absolutely do NOT remove the compounds from the water as a standard Ion exchanging water softener will do.
About 15 years ago, I remember spending something like 30 bucks for a "magnetic fuel cracking" system that supposedly could increase fuel efficiency by some outrageous amount. That didn't work either. In fact, many of those companies have been investigated by AG's all over the US.
The phrase "buyer beware" comes to mind.
Sorry for the long post, and I certainly don't want to insult anyone's opinions or decisions, I just wanted to share my personal experiences and actual test findings. Hope it helps,
anthony