I love these troughs, they certainly discourage water-wasting. You really think if you NEED the water if you have to cart it around in buckets.
I use mulches, and have four water butts, linked together, and I only use tap water for watering in new seedlings. Some people on site have hoses rigged up to the tap for hours on end every day, its really unnecessary.

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~ What do I think of Western civilisation? I think it would be a very good idea ~ Gandhi