Recycled or 'grey' water should be used with care, but can be useful in times of water shortages
Water: collecting, storing and re-using / RHS Gardening
RHS How to Garden: A Practical Introduction to Gardening: : DK: 9781405366403: Books
How does grey water system works - Netsol Water
Grey Water Re-Use
Watering / RHS Gardening
How to DIY a water recycling system to take water from the drain to my yard instead of the sewer - Quora
How to Treat Grey Water for Irrigation – TWL Irrigation
What Is A Greywater System And Why Would You Want One?
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RHS Plant Guide: Rock Plants
How to DIY a water recycling system to take water from the drain to my yard instead of the sewer - Quora