Choosing rainwater & wastewater products
Collecting and using rainwater
For many renovations, installing a rainwater tank will be a requirement.
In any case, it can be a great way to save even more water, once you already have a water efficient house and garden. In most areas rebates are available on the cost of rainwater systems (unless they're already required by law).
To get the most out of your system, firstly make sure you have a decent roof area from which you can collect water. You can maximise the area by using underground tanks, or above ground tanks that use a 'wet downpipe' system. Secondly, make sure you have a decent tank capacity - 3,000 litres or more is recommended if you have room.
You may have to install a minimum-sized tank to qualify for rebates. If space is tight, many innovative solutions are available, such as under-floor bladders and interconnecting plastic tanks that double as fences.
Lastly, make sure you're connected to at least one indoor use like toilet flushing or the washing machine.
If you're collecting rainwater from a new roof, choose a compatible roof material (steel is ideal, most tiles are also fine).
'These systems do need regular maintenance, but it's no big deal when you get used to it.'
If you're collecting from an old roof and will use the
rainwater for drinking, your builder will need to check
for lead flashing and seal it. You may also need special
gutter treatments such as screens to keep out debris.
Not all states allow rainwater to be used for
drinking water.
[See Your Home: Rainwater.]
Recycling wastewater
Domestic greywater systems collect and treat wastewater from the shower and laundry for reuse in the garden or within the home for toilets or washing machines.
Arrange drainage pipes so it will be easy to collect greywater at one point. Regulations vary so check first with your local council, and then make sure you seek expert advice on choosing and maintaining your system. In many areas rebates are available.
Be aware that greywater systems do require a reasonable level of homeowner commitment to maintenance, to avoid health risks and soil damage. If you're using untreated greywater on the garden you'll need to check with your expert that your soil and plants can handle it. You'll also need to use detergents and powders that contain no phosphate or salt.
A licensed plumber must be used when installing
rainwater and greywater systems, in addition to any
plumbing work within the renovations. Many plumbers
will be able to provide specialist advice regarding
rainwater collection and usage.
[See Your Home:
Wastewater reuse.]
