Mr. Liam McCarton:

I apologise if I have missed any of the Deputy's points. She spoke about the issue of quality. I am not sure whether I picked her up correctly. This has been an issue when harvested rainwater has been used. No specific quality of water is required for use within toilets. There is an international tendency to look at bathing water when an approved standard is being set. We have found that the quality of captured rainwater, for the purposes of domestic systems, is quite high. It depends on the operation, maintenance and design of the system in question. The qualifier is that the tank needs to be sealed or closed. I do not know whether the Deputy noticed that the six months of results were peaking up and down. That was during the commissioning phase, when a great deal of work was being done on-site and the tank was not sealed or kept closed. There was ingress of various bacteria. In our study, we did not find any significant issues with the quality of the rainwater in cases where the tank was sealed and a filter system was in operation. One can also avail of the assistance of a biofilm.