Kitchen mixer tap is slowing down!

Could be the tap filter?? Does it have a wire gauze filter at the spout? This will screw off with the aid of some thin-nose pliers - take it off carefully 'cos there's a spring loaded filter behind that; have the washing up bowl for things to fall into. Disassemble, rinse all the parts out, wonder where all the crap is coming from, reassemble, try again.

I've done this a couple of times with mine over the years, but in fact my pressure is low all the time: this group enlightened me just a few weeks ago that my problem is to do with the fact that my tap is supposed to be pressurised -- I don't think this is your problem though.

John

Your mixer will either be a ceramic cartridge jobby which goes from on to off in a half or quarter turn - or a 'turn it several times' rubber washer jobby.

If the latter, remove the top and you should see a splined stem. At the base of this is a circlip. Likely its come adrift. If so just push it back into its groove.

IMO once they start coming adrift they keep doing it - replace the jumper assembly - available in B&Q.

The gauze is there to aerate the water and give a smooth flow - well worth cleaning.

The Combi will have a flow restrictor at its input end - could this be a cause of the problem - are all hot taps effected?