We already replaced the discharge valve (43544) and the trickle stopped. Now we have the opposite problem and the cistern fills very slowly. I think I need to replace the fill valve (42181). Or, is there a quick fix that you might have tried and tested?
Thanks Sarah

Sarah, July 2009

I have the same problem. I'm assured that an inlet valve maintenance kit (a new diaphragm) solves the problem. Grohe part no: 43.722. Available from several places - I used Showershack, 0845.1264141. Price £7.17 plus VAT; expensive little diaphragm but cheaper than the whole valve which was about £25. I shall attempt my repair tomorrow when it arrives!

Hencot, August 2009