| Greywater economics |
The size of the grey water market is potentially enormous as 50-70% of all domestic, and hotel water is grey and can be recycled for washing, toilet flushing, or gardening purposes.RationaleInstead of paying $8-12 per 1000 gallons for sweet water, use recycled grey at a fraction of the price. Why bother with desalination?USA example Lets take a large condo with 30 apartments. Average daily use is 66 gallons per person. So average yearly needs are roughly – 30 apartments x 4 people per apt.x 365 days x 66 gallons = 2,900 kilo gallons of water of which say 50% is grey and can be recycled. A Kilo gallon costs $11 in Massachusetts, so the water bill is $32,000 per annum and the water savings will be $16,000. Our system costs around $60,000 fully installed so pay back is just 4years! European exampleLets take a large apartment block with 30 apartments. Average daily use is 200 litres per person. So average yearly needs are roughly – 30 apartments x 4 people per apt.x 365 days x 180 litres = 7884 tonnes of water of which 50% is grey and can be recycled. A tonne of water costs €4 in many parts of Germany so the water bill is €32,000 per annum and the water savings will be €16,000.Our system costs around €50,000 fully installed so pay back is just 4 years! |