We converted our ground floor loo to use rainwater collected from the house roof.
We put a spider cover in the top of the down pipe to prevent leaves going down the drain. The gutters needed to be cleaned too. We used a rain barrel, a shop bought rain barrel diverter to take water from the rain pipe, a home made plastic perspex filter, a normal hose pipe fitting, a length of water hose pipe, some jubilee clips, a brass 90 degree bend to go round the corner, hose clamps along the wall, a ball valve to allow us to switch back to mains water. Then there's an isolator on the existing plumbing that we can turn off the mains with.
The whole project cost about €100 in total for all the components and took around eight hours to complete.
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