If you get a leak on your water softener, it could be your water pressure.

Your water pressure varies during the day and night depending on demand and excessive pressure can often cause a leak.

If you are not sure fit a PRV (Pressure Reducing Valve) to be safe. This prevents damage to your water softener and the potential to invalidate any warranty. Can be supplied with hose connections if required. 

15mm compression at both ends make these fast to install. 

Set at 5 bar but can be adjusted with a slotted screw driver.