white fur on the wall

[prendi]

i have got a lot of white furry growth on an outhouse wall.i brushed it off and put bleach on it and the next day it was as bad as ever .what could this be and how do you treat it?

[buildersmate]

Efflorescence
http://www.aldonchem....-ab-efflorescence.htm

[prendi]

thanks builders mate that was very helpful,cheers!