F&E tank scum in 6 weeks!?!

[skywatch99]

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

 

[Phill Peck]

Your system must be pumping over into the F&E tank

 

[skywatch99]

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.

 

[Phill Peck]

What boiler is it Not aware of any boiler that specifies it must be a combined Cold feed and vent

 

[skywatch99]

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.

 

[JohnD]

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