My understanding of this is that RO reject water that is not considered potable by EPA standards could work. For example many lab projects require RO water for their work. This RO reject water can be treated on-site and get used for flush fixtures. This would also satisfy the credit correct?
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Andrea Traber
Director, Sustainable Buildings and OperationsKEMA
62 thumbs up
February 23, 2010 - 2:29 pm
Yes, this would satisfy the credit since it is replacing use of potable water. More importantly, you will also want to check your local plumbing code which can be more problematic.
Since RO (reverse osmosis) reject water is higher up “water quality chain” because it is considered at least as clean as potable water you might consider additional reclaimed water uses that need higher quality water.
Peter E
3 thumbs up
April 15, 2011 - 3:34 pm
I have a related question-- we are pursuing an innovation in design credit for process water savings by collecting 8gpm of RO reject water and using 6gpm of it for cooling tower makeup. Assuming plumbing code allows, we would like to store some of the additional 2gpm into a tank to be reused to flush toilets and urinals and apply to WEcr2. We are obviously not double dipping on any of the reclaimed water (6+2=8...) but have some concern that someone might have a problem with us using the same reclaim equipment to gather water used in two different credits (ID credit, WEcr2). Does anyone have any experience with submitting something like this?
Thanks