Ian Stirling wrote:

Dave wrote:
As header. I have a cold water tank in the loft, that has a layer of
black gunge on the bottom. I found this out cos the tank fed taps in the
house are showing signs of the same gunge.

Consider where the gunge comes from - it's probably in the water.
I cleaned out the tank by the simple expedient of a long handled brush, and
swirling it round the nearly drained tank.
Flush it several times, and it was sparkling.

Depending how viscous the gunge is, you might be able to siphon
it out. Just get a nice long hose, run it out through a window,
persuade a hapless accomplice to suck briefly on the end, then
you can use it to "hoover" the bottom of the tank.

Chris
--
Chris J Dixon Nottingham UK


Have dancing shoes, will ceilidh.