Black slime

[Muddymike]

One of our downstairs toilets suffers with black slime building up in
the cistern above the water line and up in the rim of the toilet bowl.

STWNFI keeps cleaning it off and treating it with bleach but it comes back!

Only this one out of three toilets in the house suffers yet they are all
fed from the same mains supply.

Any guidance appreciated.

Mike

[Brian Gaff]

Its mould. I imagine there is a place you have not seen where it also
resides and the spores are just setting up new colonies.
I'd look in hidden bits of the cistern. it might mean dismantling it, but
they obviously like the warm weather and repeated dunking but not total
immersion. Inside the siphon?
Brian

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[Bob Eager]

We've had that. It tends to build up on almost invisible layers of
limescale.

Get rid of the limescale but using brick acid. Works a treat, but take
care.

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[Andrew]

LAck of ventilation ?. Small rooms with open water sources have
a problem in hot humid weather. Leave the door open and the lid
up (ooer missus) when not being used ?.

Complete dismantling and cleaning all the nooks and crannies
with strong bleach might be the only solution.

[tabb...@gmail.com]

Bleach is relatively effective on slimes, the sodium hydroxide content breaks down the biofilm. You probably just need to do repeated frequent preventive cleans for a bit until all microscopic traces are gone.

You may have more success if you empty the cistern then clean it. Let it refill next day. Running a bit of bleach through from cistern to pan will also help attack slime where it's hidden.


NT