Yael, too much of it will cause you problems. You can use it diluted with other water - I understand it is the phosphates in the detergants that are the problem.

Deb, I totally agree with you! It should be a regulation that new houses have tanks. They come in all sizes and colours now and can fit into all sorts of gaps.

One thing I really don't get is the aversion Sydney has to recycled water. It is not as though the water coming down the rivers to us is pure from the mountains anyway. By the time it gets to us it has been through all manner of filtration plants!