expansion tank (growth)

[hotncold]

On checking the expansion tank on my heating pumped system I can see a jelly like substance moving about, understand that this may be bacterial growth? What is the best course of action to take from here.
Also if I drain & refill system does mains feed from bottom to top work well. Are there any drawbacks to this method as opposed to re-filling through the expansion tank.
Any help, thanks in advance

 

[doitall]

Think you will find its the inhibitor, dig it out before you drain or you will block the pipes.

 

[Nige F]

Nuke the stuff.......give it a dose of Shock`n`Awe ........yee -haa....or I could send you a bottle of my micturition.....that`ll kill it too...that`s why we wee in those tanks