Green gunk in shower head

[Apfelsaft_82]

Hello, I am wondering if you can help! We have a square rainfall shower head and there is a green gunk forming where the connection from the arm to the actual shower head is, which is causing the shower to stop working. I understand this may be a build up of limescale etc. but I rigorously clean the shower head itself, I am concerned the residue is coming from the pipe, could this be the case? If so, how do we rectify it? Please see the pictures I have included.

For info, we have an old style immersion tank if this makes any difference. The whole bathroom is virtually brand new but as soon as I unblock it the gunk returns.

 

[Apfelsaft_82]

Yes the stuff is quite hard. Do this mean we may need new tank? Is there anyway of temporarily getting rid of it? Thanks!

 

[ShaunCorbs]

have a try leave the show head off and run for a good 10 mins on both hot and cold (10 mins for cold , 10 mins for hot)

does any more bits come out?

 

[gassafe]

I'd still check the cold feed tank to check it's not coming from there

 

[Unregistered]

Left it running for quite a while. No more bits coming out, then tried putting the shower head back on and it seemed bit better though there is still a slight residue building up. Think I need to get someone to look at it.

Thanks for your help.