@Andy CWS,
Anyone buying a softener, especially a Kinetico, should total the salt used per regeneration on a weekly or monthly basis and compare that figure to other softeners they are looking into buying. If the sales person doesn't give you that figure or help you calculate the total, beware.
For those wanting a twin tank type softener, here is some information for you and a number of questions you should ask the sales person. Below is my reply to someone on another forum just 3-4 days ago; someone very much like Andy. Actually most people would think is was Andy using a different name because he, as Andy, was banned there a couple months ago and ALL his posts there over like 3-4 years were deleted as useless. A bit like his posts here.
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Actually, unlike Kinetico or Fleck twins, with the Clack twin, you can have one or two or more salt tanks. Personally I'd use two so that if there's any problem with a softener, you still have one complete softener to soften water with while reducing the number of potential brine line suction leaks.
Some other questions that are more important...
Like do you get water through both tanks instead of like most Kinetico twins only getting water through one at a time?
Or, like Kinetico, does regeneration happen when I'm using water or can I delay regeneration to like during the night when no one is up using water?
Or, does each tank have a purge rinse before it goes into service, rather than delivering maybe days old stagnant water like Kinetico and most of Fleck twin control valves?
Or, does the Clack twin have variable reserve, unlike Kinetico or Fleck?
Can I still have the choice of Pre or Post brine Refill with softened water?
Can the control valves be set up with various lengths of time for each of the cycle positions of the regenerations if I need more time for backwashing, or brining, or rinsing?
Does the Clack twin allow for two back washes instead of only one like Kinetico?
Can one backwash be longer or shorter than the other, unlike Kinetico's fixed length no matter what?
Can I get other tank colors than Kinetico's black that can get real dirty really quickly?
Or, can I have a choice of counter current/upflow or co current/downflow regeneration?
Can I get parts and instruction manuals from many locations, especially online, so I can affordably and on my own time schedule repair my softener myself, unlike Kinetico customers?
Or... will a Clack twin tank type softener cost me less than the same size Kinetico?
In most cases can I get a larger Clack twin for less than Kinetico's price?
Do I have the ability to access operational history and troubleshooting data; such as the current and maximum gpm flow rates or max number of regenerations and gallons used since start up, total and average gallons between regenerations, the volume of variable reserve and numerous diagnostics data, unlike a Kinetico?
Can I change my hardness and salt dose lbs, K of capacity etc. etc. unlike a Kinetico where you have to buy a new disc etc.?
By the way, the answer to ALL those questions is YES!!