Aqua2use graywater reuse products are designed, manufactured and patented by Matala Water Technology, a company based in Taiwan.

Aqua2use offers a graywater treatment system that purifies a building’s graywater for reuse both indoors and outdoors. The graywater, which is collected from the shower, laundry, and dishwasher, is purified with both biological and mechanical filtration, then disinfected with UV-C. This purified graywater can then be reused for the toilet, laundry, and irrigation.

Aqua2use claims that their graywater treatment system can save 30 gallons per person per day – or up to 40,000 gallons a year for a family of four.

Aqua2use also carries Graywater Diversion Devices (GWDD), which collect, filter and recycle groundwater for irrigation use. They offer both an above-ground and underground model.

Aqua2use’s graywater systems were rated as one of BuildingGreen’s top 10 green building products of 2012.

LEED Credit Overview

Aqua2use graywater systems can contribute to LEED in the Water Efficiency credit category of the LEED for New Construction (NC) rating system. Aqua2use’s products specifically contribute to the following credits in LEED NC:

Water Efficiency (WE) Prerequisite 1: Water Use Reduction (0 points)
This prerequisite requires that the LEED project use 20% less water than the baseline calculation. Since graywater can be reused, such as for flushing toilets, Aqua2use’s systems could contribute to this prerequisite.

WE Credit 1: Water Efficient Landscaping (2-4 points)
This credit requires a 50% reduction (2 points) or 100% elimination (4 points) of potable water used for irrigation. Since Aqua2use reuses graywater for irrigation, it can contribute to this credit.

WE Credit 2: Innovative Wastewater Technologies (2 points)
This credit aims to reduce wastewater and potable water demand. Two points are awarded for either reducing potable water use for sewage conveyance by 50% OR by treating 50% of wastewater on-site to tertiary standards*. Aqua2use can be used toward both of these options.

*According to LEEDuser, “tertiary treatment is the highest form of wastewater treatment and includes removal of organics, solids, and nutrients as well as biological or chemical polishing, generally to effluent limits of 10 mg/L biological oxygen demand (BOD) 5 and 10 mg/L total suspended solids (TSS)”. Aqua2use claims that their graywater treatment system has BOD and TSS below these levels, so it should be able to meet the requirements of the second option for this credit.

WE Credit 3: Water Use Reduction (2-4 points)
This credit is the same as WE Prerequisite 1, except the required percentage of water use reduction is higher. Projects can earn 2 points for 30% water reduction, 3 points for 35%, or 4 points for 40%.


imageClaire Moloney

A recent graduate of Cornell University, where she studied Environmental Science and concentrated in Sustainable Development. Her interest in green building and LEED stems from her project-based coursework at Cornell, where she proposed design strategies for sustainable developments in Helena, MT and Ithaca, NY. Claire also exercised her passion for sustainability and energy conservation through extracurricular activities at Cornell, such as Solar Decathlon, Lights Off Cornell and Sustainability Hub. For the last three summers, she worked on energy projects at a town government, including an on-site hydrogen station and EECBG-funded activities.


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