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Hello,

For a school design project we are thinking about using grey water from a building to store in a retention pond through a pump system. I’ve read that grey water cannot be used for storage. Is there any kind of filter or anything similar that can be placed in the pipe system that will make grey water safe and clean in a pond?

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Hi Levi,

If you’re in the US, a pond system won’t be a viable option for a greywater project. Though it is technically possible to clean the water with a wetland treatment system so it’s clear, odorless, and unoffensive to see in a pond, this system violates some of the basic health and safety requirements of all greywater codes. Since greywater is nonpotable and could contain germs, it should not be visible or accessible to people. Systems also should be designed so the water soaks into the ground to prevent ponding or runoff, or potential for mosquitoes to breed.

(If you are trying to ecologically treat the water for disposal, like an onsite wastewater system, and the system will be designed by engineers, and monitored, and tested regularly, then a retention pond after other treatment could be possible, but this is not really considered a “greywater system.”)

I’d encourage you to return to the reason why the building needs a greywater system to help you find the best system. Is it to reduce potable water demand? Is there a landscape to irrigate? Is it to create habitat? Greywater is a great source to irrigate plants, and if you are wanting to create a pond for habitat reasons you could look into a rainwater-fed pond instead.

Hope this helps.

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