I water my garden with a trickle that runs slowly from a hose attached to a large green water tank. It takes forever to soak into the soil around my tomato and aubergine seedlings. Yet I take the time on some evenings because it's a time of day I sometimes have all to myself, and because municipal water is expensive and I feel guilty if I use it for what is only a pastime. I grow vegetables and fruit, but I don't have to. But for middle-class homes accustomed to switching on a washing machine or loading and reloading the dishwasher, the future may be somewhat different. The original plans for the house in which I live, which was built in 1910, stipulated that all waste water should be disposed of in the garden - that excluded sewage, which was left in the service lane overnight for the night soil man to collect. Well, some of us are back to using bath and washing-machine water for the garden, and, sooner than we think, it may be essential. The struggle for clean water is already a s...

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