You should have raw water to the kitchen sink.

Do you have valves and a by-pass on the softener.

Perhaps you could open the by-pass and close the softener to test, although I think you said it was only 15mm.

What model is the softener.

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It is a Waterside MC350. Yes, we do have a direct connection to kitchen sink, but at the moment the kitchen is not functional and is blocked with a mountain of building materials. I need to clear this anyway, so will try a test tonight. But as you say, it is already restricted from the 22mm down to 15mm at the source of entry to the building.

It would be interesting to know what the actual mains pressure is.

Did they use the high flow hoses when they connected it.

You also mention a pressure reducing valve valve, Culligan softeners will take up to 5bar, so is/was it really necessary, and what pressure have they set it at.

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