I wanted to ask CS members about their experience with E61 mushroom scale buildup.
I took this photo 1 week after performing a full boiler descaling of my Giotto, including opening up and descaling of the E61 group & mushroom, and letting it soak in some descaling solution for 2 hours, followed by emptying and flushing the boiler 2-3 times above the water line.
I was very surprised to see that scale plaque had formed just 1 week post-descaling! *This time I not only soaked it in a descaling solution, but scrubbed that dirty little mushroom with a stiff brush.
Is this normal to get scale plaque 1 week after?
I am using a Brita filter with fairly soft Canberra water.