The other big difference between water softener units is if they have one cylinder or two.
Two cylinders are 100% the best option as it has the ability to do two things at once — provide soft water and clean if required.
As a rule the single cylinder type tend to be larger in size and waste more water and salt.
There are two things to keep in mind with the single cylinder type:
1. Firstly, they can only do one thing at a time. When the water softener goes offline to regenerate it is unable to supply soft water at the
same time – this is why they are scheduled to carry out a regeneration
at night time when in theory no water is required in the property.
2. Secondly, again due to the functionality of only having one cylinder,
it does not have the ability to carry out the regeneration using soft
water. Due to this the valves are subjected to hard water and will scale
up. Therefore, repairs are likely and annual servicing is essential.
In comparison — with a twin cylinder water softener you will receive softened water all day every day regardless of how much water you
use. Even if a tap was left running accidentally, it would not revert
back to hard water.
Furthermore, the entire regeneration cycle is carried out with
softened water protecting the working internal parts from the scaling
and damage.