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Xringer · 11-15-11, 10:32 AM

I'm thinking of building a large PVC 'U' trap under my tub. (Maybe 4 to 6 feet tall).
Inside the PVC 'U', I would run a 1/2" flexible copper loop, fed from the cold water source.
The bottom of the 'U' would consist of four 45deg elbows.
I would put a 'T' at the very bottom of the 'U', to use as a clean-out. (Diamond ring trap).

Since greywater is very low pressure, a screw-on cap or PVC valve would work for the clean-out.

The copper entry points would be at the top (using Tees), above the 'U' water line,
so the seals wouldn't have to be super tight. Just water-resistant, like RTV.?.

Don't know how efficient it would be, but it's got to be better than nothing..

I was just thinking about how these things work. In addition to recycling
the pre-heated water, some of your lost body heat would also be recycled..

11-15-11, 10:32 AM	#8
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	I'm thinking of building a large PVC 'U' trap under my tub. (Maybe 4 to 6 feet tall). Inside the PVC 'U', I would run a 1/2" flexible copper loop, fed from the cold water source. The bottom of the 'U' would consist of four 45deg elbows. I would put a 'T' at the very bottom of the 'U', to use as a clean-out. (Diamond ring trap). Since greywater is very low pressure, a screw-on cap or PVC valve would work for the clean-out. The copper entry points would be at the top (using Tees), above the 'U' water line, so the seals wouldn't have to be super tight. Just water-resistant, like RTV.?. Don't know how efficient it would be, but it's got to be better than nothing.. I was just thinking about how these things work. In addition to recycling the pre-heated water, some of your lost body heat would also be recycled.. __________________ My hobby is installing & trying to repair mini-splits EPA 608 Type 1 Technician Certification ~ 5 lbs or less..