There are a number of manufacturers that do greywater recycling/rainwater.The technology is in its infancy in the UK and a lot of work is underway to assess the quality of systems. Be warned though the majority of domestic greywater recycling system can cost around �1kWater Dynamics – 01704822615 Aquasaver – ? The Green Shop – 01452 770629You could speak to the Environment Agencys Demand Management Centre at Worthing (They are writing up a report)Building Services Research Information Association (BSRIA) 01344 426511