The irrigation system uses rain water collected off my roofs. This is pumped up to a pressure of 3 bar, filtered and used to irrigate the garden and flush the toilets. As it is rain water it is exempt from hose pipe restrictions.

Incidentally there are two people using two dual flush toilets 5L/10L. We still flush about 800-1000 Litres of water down the loo each week. The Property is on mains sewage so that would have cost (2016) about £2.40 a week i.e. £120 a year (Bloody hell).