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Discuss Shower inlet blocked. White maggot like substance in the Plumbing Forum area at

  1. richnr

    richnr New Member


    Looking for some advice. Once a week I have to turn off the water supply and clean the inlet of the hot water on my shower. It is a pressurised heating system and no other hot water appliance is blocking only the shower.

    I have attached some pictures. Is this a shower problem or do I need to flush out the hot water system.

    Any help is greatly appreciated.
    20180805_205957.jpg 20180805_205949.jpg 20180805_205940.jpg
  2. scott_d

    scott_d Plumber GSR

    Hot water cylinder or combi boiler?
  3. king of pipes

    king of pipes Trusted Plumber GSR

    Looks like a build up of limescale what sort of system do you have ? Cheers Kop
    • Agree Agree x 1
  4. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Where in the country are you , limescale area ?
  5. richnr

    richnr New Member

    Thanks guys and sorry for not responding quicker. We have a large megaflow water tank with a smaller tank above. This is a pressurised system with a boiler outside heating both central heating and hot water.

    In Lanarkshire so it is a soft water area and the house is only 11 years old.

  6. dan_the_plumber

    dan_the_plumber GSR

    It could be the dissolved sacrificial anode. Maybe take shower off, attach a hose and temporary valve, then flush pipes out.
    You may also want to want to replace the Emersion heater including new anode.
  7. richnr

    richnr New Member

    Thanks for the feedback I will look into it.
  8. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    The red expanssion vessel is wrong , its only meant for heating , that cylinder doesnt need a expansion vessel . Get a local qualified G 3 engineer in to look at it . It doesnt have a anode.
    However I have no idea what the gunge is but I would do the above with a full flush out (inc cylinder ) and go from there
  9. Ch4 plumbing

    Ch4 plumbing Plumber GSR

    Looks like a standard robokit for the heating, if you look closely the filling loop is attached so it is correct (with the exception of the attached filling loop)

    The unvented cylinder should be serviced annually so get a G3 qualified engineer in to take a look for you and they will check the strainers and be able to give you a better idea on what's going on.
  10. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!


    Yep appologies you are correct (not to self ,stop using phone to look at pics lol )
  11. richnr

    richnr New Member


    Thanks for all the feedback appreciate it. Will get this looked at during annual inspection.
  12. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Is the gunk hard or soft ? Rich
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