John already spoke to them on this one and got the expected answer.
The nylon bristles are falling out because your using other chemicals and not ours :

Usual get out clause. I will have to stop using the wheel acid on those tricky stains now.

The machine is only 10 months old so still under warrenty but they think it is the gears that have gone.
And guess what, Gears are not covered under the warrenty they are classed as consumables

Its like buying a car and 10 months later the gear box goes and they say sorry not covered under warrenty.
So all of you that have an envirodri and use it for aggitation of chemical and not only for sponges beware.