@susanr27,
OK well first of all let me make one thing clear.. I am a former employee of both rainsoft and GE Avantapure.. As far as it goes for the water quality the avantapure has in comparison of that to the rainsoft has to offer, it isclose to the same. The avantapure may have a lead by 10%. But, the avantapure is about 30% more efficient and saves you a lot of money in long run, maintenance cost can be very expensive , simply because of maintenance and common knowledge on how water filtration works... Unlike the rainsoft, the avantapure is configured with four stages of filtration as apposed to the rainsoft's two. The rainsoft piece of equipment has an ion exchange resin, and carbon, with a common fleck** Fleck is a the type of plumbing piping, and overall internal functions that a water softener has. Which is also found in 90 percent of any other type of whole house water purification systems. GE has their own. Now, carbon removes chemicals like chlorine, tetracycline, and such, while and ion exchange removes your dissolved solids and such, therefore making the water zero soft and 98.6% contaminant free. . The avantapure has both of the above but it also kdf and garnet.. Let me give you some information on how this works.. Carbon, removes chlorine and other chemicals, but by doing so it deteriorates, therefore making it necessary to change. The avantapure also has kdf and garnet in it. remember.... Kdf is a copper chrome alloy which removes chlorine and other chemicals effectively, which means that the carbon doesn't have to be replaced, or stressed as much. The garnet is used to control water turbidity, many people dont know about this including the sales man or so called managers of " rainsoft " So, because the carbon isn't used to remove the chemicals, rather than having to enhance taste like is original purpose, it never has to be replaced.. thats the most significant difference between the avantapure and rainsoft. Also, rainsoft uses the fleck, as the avantapure uses its own piping and it is reversed, for cleaning purposes.. it only cleans the part of the filter that has been in used as in comparison to the rainsoft that cleans itself when ever it feels.. A rainsoft, or any other water softner cleans, or or rejuvenates itself when the programmer tells it to.. the avantapure analyzes your water and does so accordingly.. When you go out of town. It goes in stand by mode.. Not rejuvenating when it does not need to, Unlike any other filter that would waste your salt and water when it is unnecessary it cleans itself accordingly to the water consumption in the family, also reducing salt usage by 60%..., but, when you have more water being used then originally programmed, it adjust itself accordingly as apposed to any other filter that is still on the same program.. So, if you have a kid, or someone move in, or an adjustment to the amount of people staying in your home, the average water softner will not clean itself accordingly, but will lead itself into malfunction.. Leading it to more maintenance. That is as simple as I can make it... Hope this information was helpful, this is my knowledge in the water business for 10 years, not a sales pitch....