Diverter valve in double bowl sink for gray water

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Doug Henningsen

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Living in the bone-dry state of California we typically save "cleaner" kitchen water in a small container in the sink to water plants.

I'm considering replumbing one of the double bowl kitchen sinks (w/o the disposal) to collect gray water. I would install a 3-way diverter valve after the P trap under the "gray water" bowl to allow the use of the waste line when needed (ie cleaning) but generally, we'd commit that bowl to gray water. Gray water would drain to a collection container in the crawlspace with a float pump then pumped to the garden.

Outside of the permit, what other issues should I consider?
 

John Gayewski

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Living in the bone-dry state of California we typically save "cleaner" kitchen water in a small container in the sink to water plants.

I'm considering replumbing one of the double bowl kitchen sinks (w/o the disposal) to collect gray water. I would install a 3-way diverter valve after the P trap under the "gray water" bowl to allow the use of the waste line when needed (ie cleaning) but generally, we'd commit that bowl to gray water. Gray water would drain to a collection container in the crawlspace with a float pump then pumped to the garden.

Outside of the permit, what other issues should I consider?
Kitchen sinks can't be grey water if I remember right. Lav, bath, and clothes washer I think.
 
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