I live in London and building a house in Scottish Highland. It has been a real challenge, particularly managing contractors !
The current contractor is suggesting that I use Graft One2clean system instead of Biodisc, which is the suggested system by my architect. My architect doesn’t have any experience with the Graft One2clean system. On reading around Graft One2clean seems to a sensible system. Does anyone has use this in Highland and any challenges in managing post installation.