Greywater vs Rainwater

Thinking about buying a rain water tank to help water the garden?

STOP!

Greywater systems are:

The average garden needs between 6,000 and 12,000 litres per month to flourish.

This means the water tank capacity needs to be between 10,000 and 25,000 litres to cope with two months lack of rain over the summer / autumn months.

Compare the options available:

More information:

Solution	Hand Watering	3,000 litre tank	15,000 litre tank	Greywater system
Water Source	2 Hours per week = 10,800 litres per month	= 2 weeks of water after last substantial rain	= 6 weeks of water after last substantial rain	2 People: 6,000 litres per month 4 people: 12,000 litres per month
Unit Cost		$800 - $2,500	$3,000 - $8,000	$1,100
Installation		$1,000 - $2,000	$3,000 - $6,000	~ $400 - $1,400
Additional costs (pumps etc)		$400 - $1,000	$600 - $1,500	Pump and Irrigation system included
Total cost (approx)		$2,200 - $5,500	$6,600 - $15,500	$1,500- $2,500
Water Saving	Nil	~ 1,500 litres per month over summer	~ 10,000 Litres per month over summer	~ 12,000 Litres per month over summer (equivalent to 15,000 - 20,000 litres of fresh water due to increased efficiency of greywater capillary irrigation).

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