My keg lager is losing its head



Drink it quick……Well, as long as you don’t lose yours [head that is] you may be able to solve this problem yourself, quite easily.

The main reason for poor head retention, as we in the Trade call it, is usually dirty glasses. Now I know what you are saying,” I Bloody well clean my glasses properly”.

The thing is, there is cleaning your glasses and “cleaning your glasses”. Before we talk about glass cleaning in detail, lets talk about why it is so important to do it properly. Ask yourself how many times does a single glass get used every day. Well if you are doing a good trade the answer may be very many.

Glasses retain grease from people’s mouths, from lipstick and even from some drinks, which are served in them. Always remember this, Grease and Beer do not go well together. So it is important to ensure there is absolutely no grease or other contaminates in your glasses.

The other obvious reason we must clean glasses thoroughly is to prevent germs being passed on to other people.

So here we go:

  • Make sure your glass washer is cleaned regularly every day.
  • Have your glass washer serviced at regular intervals. See makers guide lines.
  • Make sure the correct cleaning and rinse aid products are being used, and are always full.
  • Do not use the glass washer for anything else other than glasses. Sorry! No coffee cups, ashtrays. Dinner plates.
  • Replace damaged or scratched glasses. They are not that expensive.
  • Never polish glasses. Jack Duckworth might do it, but you shouldn’t do it in the real world.
  • Always stack your glasses on proper stacking mats.

If the head on your beer is still poor, contact your local Tech Services.


  1. You haven’t mentioned about lager being too cold. I drink Carling and even if it is served very cold it still bubbles up great. The same pub sells Carlsberg and that just looks flat .No bubbles.Is it to cold or what.

      • Our fosters is the only beer that goes flat as soon as it’s poured. Nothing wrong with glasses as any of our other 4 lagers will hold a head in the glass. Is the line old & needing replacement or bad product? Problem has been for over 3 weeks now

  2. If it is a constant problem then get tech services to check that the correct gas pressure is set on the product valve. Too low a pressure will mean that the product will not absorb the correct amount of gas and be flat. Sometimes having them increase the length of the reducing pipe(very narrow guage to the pump) to the pump can up the gas agitation and the head.

  3. are you using branded glasses if so try fosters in different glass also check out philC’s comment for renovate the etching on some branded glasses tends to need renovating more than others

  4. ( Anyone with flat larger in the glass.) If it’s more then one brand of lager it’s the glass washer. Here’s a little test people can try. Get 2 new unused pint glasses from a box that’s not been in the glass washer . Pull 2 pints, then you should see the difference.

  5. from our troubleshooting guide Flat Beer –

    Foamy head disappears quickly; beer lacks brewery fresh flavor

    -Beer temperature is too cold.

    -CO2 pressure is set too low.

    -Dirty glassware

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