The average organization might use stored rainwater to water gardens or flush toilets, uses where people do not come in contact with the water. But considering that rainwater is neither a reliable source nor a particularly ample one, while the amount of water used to flush toilets at the institute is huge, the institute decided to use "reclaimed water," a reliable source, for this purpose.
相較於坊間一般機構會利用雨水貯留做為景觀噴灌和廁所沖洗等不與人體接觸的用水，環球考量雨水來源不穩定，量也較不充足，而學校廁所用水量大，就決定採用來源穩定的「中水」來供應洗廁用水。