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Astonishingly, a typical office building uses over 70% of
its water just to service toilets. True to its ideals, Garigal eliminates this thoroughly wasteful use of fresh water
with on-site sewerage recycling, rainwater capture and greywater irrigation.
This very clever conservation means the only taps drawing
on potable water are in the kitchenettes and bathrooms.
And importantly, this uninterrupted irrigation keeps Garigal's native landscaping verdant—regardless of any restricitions
by Sydney Water.
Saving more than a million litres
A gigantic 54,000 litre tank sits in Garigal’s basement. As the building's waste water is piped into it a complex combination
of aerobic digestion, denitrification and clarification begins.
The processed water is then subjected to multi-media filtering and uv irradiation to achieve compliance with both council
and Sydney Water standards. Regular testing ensures it
stays that way.
Fully tenanted, Garigal could treat 4900 litres of waste-water a day, 5 days a week. This would see an amazing 1,274,000 litres processed in one year—and not pumped into the Pacific Ocean.
Three substantial advantages are achieved: only recycled water is needed to flush Garigal's toilets; an ample and ready supply
of greywater is available for the nurturing of the gardens;
no connection to local sewerage systems and, therefore,
no charges.
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Tanks a lot
Two massive tanks act as insurance that Garigal never needs
to use precious fresh water for toilet-flushing or irrigation. Up to 40,000 litres of rainwater can be harvested from the building’s expansive rooftop.
When the flow exceeds their capacity the excess is carefully released into the adjacent national park.
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