You answered a question about water softeners for me, I wondered if you could answer another one. We are having our house re-plumbed. What would be a reasonable charge for having a water softener installed (on top of what we are paying)? Our builder has given a price - plumber is already working in the house (price is not for the actual softener, we are supplying that ourselves) - but I'm unsure how much work is involved, figure seems a bit high to me.