lillyblue,
I am sorry that you experienced an all-too-often phenomenon in this industry. Huskters come in all forms and from major brands to local businesses to internet vendors. Unfortunately, by the time many realize what has happened, it is too late.
seattlecosmo
The best way to determine what system works best for your needs is to review the different types of softeners out there. Basically, there are single tank and twin tank models.
Single tanks come in four basic forms (with variations). An exchange tank, a timer system, a demand system with reserve capacity, and a demand system with a hardness sensor. Today's demand systems come in two configurations: component (separate tank and brine drum) or integrated (cabinet model with tank inside brine drum). Except for exchange tanks these all use electrical components.
Let's forget the exchange tanks and timer systems, for now, as they are very inefficient. Exchange tanks need to be retrieved monthly by the company renting them to you and ?'exchange' it with another one. With timer models, regeneration is a guessing game and no matter how cheap they are, they won't provide satisfactory performance for anyone serious about their water. It's a landlord's special.
A demand system with a reserve capacity must be fiddled with to get the optimum performance. One of three things happens. Think of it as flipping a coin--with three sides!
1. The coin lands on heads. It hits the reserve capacity, say, at 11pm and nobody uses water after that. The softener goes into regeneration the following morning at 2AM using the complete dosage of salt, even though the resins have not yet been completely exhausted. With a large reserve capacity that could equal more than 30% of the tank. Yes, you have soft water but you waste salt.
2. The coin lands on tails. It hits the reserve capacity at, say, 8AM, and with water being used through out the day, chances are you could run out of soft water by the time evening rolls around. Someone takes a shower and suddenly the water heater fills up with hard water, which needs to be diluted over the next 40 or 50 gallons until it become completely soft again. Very efficient as far as salt is used (READ More gallons used per pound of salt) but why buy a system that is designed to fail to do what it is supposed to do, which is to provide soft water?
3. Here the coin lands and stays right on its edge. It regenerates exactly at its most optimum resin exhaustion--right at the end of the reserve capacity. That would be very rare to hit that mark exactly, if ever.
The demand system with hardness sensors use an active sensor placed in the resin bed and when hardness reaches that point, it sends a signal to the control valve to regenerate the following morning as long as you electronics and clock are in working order. The sensors normally can not be moved or adjusted as far as I know, so you may be stuck with factory settings.
It is a gamble but that is the nature of the technology. If you are satisfied with those results, than you can save money on your initial investment.
Twin tanks provide a continuous flow of soft water. Properly sized tanks will serve your family well. They regenerate with softened water so your resins are less likely to foul and last longer. The brine tank fills with soft water which can prevent many problems associated with hardness deposits, salt crystallization, and contaminating brine water.
As one tank becomes exhausted, the other kicks in automatically and the previous tank begins to regenerate. Then it sits in reserve and waits until you the other tanks has reached full capacity to begin softening your water all over again and again.
The initial costs are more but it will provide peace of mind that every time you turn on the faucet, you are assured that water will be treated and that salt efficiency will remain consistent and regular. Eventual cost will be less over a period of time. A quality softener should last decades.
No coin flipping here.
For further explanation of different types of softeners go to Bob Villa's site.
http://www.bobvila.com/ArticleLibrary/Task/Building/DrinkingWater.html
Making a good choice is understanding your options.
Andy