This is something gathered around the magnet on my water bottle. It's inside and soft.[img] 
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Does your electrolyte of choice have an iron supplement in it?
Just Surrey's finest tap water.
that'll be it then, there's low levels of iron oxide in the water, isn't there.
or you have a fungus/mould growing in there that like a magnetic field to thrive in 🙂
Whats the reason for the magnet?
The magnetic attaches to a magnet on the frame so you don't need a cage.
It's posh.
Surely a bit of bleach in there will clean that up for you. What could possibly go wrong???
Now thats a good idea! Would it stay fixed off road?
I want to be sure so maybe put some cillit bang in my water?
Yeah stays on no matter what.
[i]Would it stay fixed off road? [/i]
you need old skool steel scaffold pole frames for it to work properly 😉
Yorky ..it's one of these
[img] 
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Do you live in an 80-year old house with iron pipework?
It looks like iron / bacteria growth.
It's a 30s house.
Am I going to die?
[i]Am I going to die? [/i]
yes.
but not from this.
[i]Am I going to die?[/i]
[i]yes.
but not from this...[/i]
..today, at least.
DrP
So a regular scrub and it should be ok?
Ah, looks good! I could do with some magnetic SPDs after my embarrasing city centre tumble last night 😆
Give it a scrub and pop a miltons tablet in there and you should be safe 🙂
use milton sterilising solution instead of bleach
I could do with some magnetic SPDs
Brilliant, books slot on dragons den