I’ll start by saying my dad Sold, Rented and Serviced Water Softeners for approx. 40-years. I was along for many service calls and installs in the early days. He finally quit and granted ownership of all the rentals to the renters about 3-years before he passed away in 2011.
First, Have your water tested for everything that is in it so you and the dealer’s company know what they are dealing with.
Here is an excellent article to read and enhance your knowledge to make a better decision on your needs: http://www.popularmechanics.com/home/interior-projects/how-to/a150/1275126/
Check with some of the smaller private name dealers, they may provide better service, quality & pricing. Culligan & Kinetico have BIG Names and thus Big Prices.
When looking at some units, the tanks may be the same physical size but have greatly variable about of Grains of Resin from 25,000 to 60,000 or more. The more grains the harder the water and the more water you can use between regeneration’s.
Outside of the two big names mentioned, most softeners come with an Autotrol or Fleck Valve Control Head. The most popular are the ones the meter the usage to determine when you used the limit of water before a regeneration. The only real electric usage is to run the timer/clock set so that it regenerates when it is most likely nobody will be using water (generally the wee hours of the morning 2am-4am) so you don’t draw hard water into your water heater. The rest of the work is done by water pressure.
The units at Mills Fleet Farm and other Big Box stores may have the same Control Head as your neighborhood plumber or water dealer has. The big thing is the number of Resin Grains for how much water it’ll handle.
Here is an online calculator to help you determine the size of softener needed: http://www.qualitywatertreatment.com/water_softener_sizing.htm
Personally, my home had a softener with a fleck metered valve when we bought it and had 5-6 (depending on College schedules) of us living here with Chaska City Water at 24-26 gpg, thus according to the calculator we need 11,700 grains removed per day with a 48,000 grain unit, it was regenerating every 4-days. Now with just two of us, it only regenerates once every 12 days, assuming per the calculator 75 gallons per person per day.
On the webpage with the calculator, I clicked on an ad and found I could replace mine for approx. $900 buying online, but I’d prefer buying from a local neighborhood business or someone using (Mike W) or sponsoring this website “IDO”. http://www.qualitywatertreatment.com/PDF/6700XTR_Spec_Sheet.pdf
Good Luck and happy bathing!
PS: A Simple test to know if you have hard or soft water is to wash your hands with Soap. If after washing and rinsing a little, your hands don’t slide easily and feel a bit slippery, you have hard water. With Soft Water, your hands with continue feeling slippery for a while because they are clean.