Hi to everyone thanks for the add. I'm alex. Have been lurking for a few weeks reading everything I can. I've not started window cleaning as yet as I have a few other things going on but hopefully will be starting soon. I've been collecting a few second hand bits of equipment to get me started. Hopefully will be setting up with my brother who has years of experience but he's mostly been doing abseiling work. He was one of the cleaners on Beetham tower in Manchester. Rather him than me haha. Anyway loving the forum all seems very friendly and helpful. Anyway first newbie question. .according to the ppm map Merseyside has 100 ppm will I need a full ro system or just di.