F&E tank scum in 6 weeks!?!

Discussion in 'Plumbing and Central Heating' started by skywatch99, 13 Jan 2016.

  1. skywatch99

    skywatch99

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    Hi,

    After recent events I totally drained the system and F&E tank. I gave the tank a good clean and bleach out, clean the system with X800 and then refilled the system with x100.

    Now I look and the water in the tank is covered with white 'scum' and greasy to the touch.

    I think there might be some more sediment at the bottom, but not really checked that out yet.

    What might be causing this so soon?

    More importantly, can I do anything to stop it?

    Thanks
     
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  3. Your system must be pumping over into the F&E tank
     
  4. skywatch99

    skywatch99

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    Thanks for the quick reply.

    For info the boiler is on the ground floor, the pump on the 1st floor and the tank in the loft. It is a combined vent and feed system as per the boiler instructions. The grundfoss pump was on '3' and is now on '2' as it is much quieter!

    How do I proceed to diagnose and cure the problem?

    Thanks.
     
  5. What boiler is it Not aware of any boiler that specifies it must be a combined Cold feed and vent
     
  6. skywatch99

    skywatch99

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    It's a potty suprima, and it can have either a combined or separate feed and vent. Both are shown in the installation manual.
    System is 18 years old.

    Thanks.
     
  7. JohnD

    JohnD

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    Could it be bacterial slime? When I had it there was stringy white jelly in the water.
     
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    DIYnot Local

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