EPA Regulations

STORAGE CALCULATIONS FOR AEROFLOAT GREYWATER TREATMENT SYSTEMS

The EPA has been behind the preparation of an Australian Standard which stipulates that greywater systems need to treat or store 75% of the daily water usage in 1 hour. The daily water usage is calculated by multiplying the number of berths x 150 litres per berth per day. For a 12 berth boat the peak hourly flow produced is:
(150 litres x 12 berths) x 75% = 1350 litres

The Aerofloat-750 treats 750 litres per hour of greywater, the storage requirement for a 12 berth boat is:
1350 - 750 = 650 Litres

NOTE: To satisfy AS-4995-2009 Aerofloat has developed products with high treatment rates (750 litres per hour and 350 litres per hour) to keep down the overall weight. However if you installed a system that treats at a rate of 100 litres per hour you would have to store 1250 litres of storage, that is 1.25 tonnes of weight when full. This should be a very important consideration in your decision making process for which greywater system you install. Storage is normally provided by using 300mm PVC pipe.