Hi - I'm seeking some impartial opinion on whether a fault with my water softener has been caused by a faulty part or whether it has been caused by my plumbing system.

To cut a long story short, my house is 5 years old and has a pressurised water system with a Megaflo. My incoming water pressure is about 2.2 bar. Earlier this year, the plastic blend valve broke on my water softener causing a serious flood. The engineer replaced it and it happened again 3 months later.

There are 2 possibilities: The plastic part is not up to the job. Or my plumber should have fitted a shock arrester somewhere near the water softener. Either way it begs the question, why didn't it happen sooner?
My main concern is to prevent it happening again. What do you think is the most likely cause of the problem?

Is there not a rating in your water softener manual/instructions for max pressure?

2.2 bar should be well within the static pressure of the softner.:wonder:

Mains pressure 'expansion vessels' are only normally fitted in excessive pressure areas.:(

What make is the softner?

Mains pressure 'expansion vessels' are only normally fitted in excessive pressure areas.:(

except for when you have an over-zealous m&e engineer of course! we fitted loads of megaflows into new houses and apartments a few years ago until the building contractors reaslied that we didn't necessarily require them.