For Branched Drain Greywater Systems
Summary: Special plumbing fittings which reliably split a gravity flow of unfiltered greywater into two streams, for use in Branched Drain Grey Water Systems
Branched drain greywater systems provide reliable, economical sanitary, low maintenance distribution of household greywater to downhill plants without filtration or pumping.
The key component is the flow splitter. These flow splitters are ABS plastic double ells which have been drilled and tapped to fit an inspection/ cleanout plug.
Complete design and installation instructions for flows splitters are found in The New Create an Oasis with Grey Water (book).
Typically, systems use at most one 2" flow splitter for the first split, after which the pipe is reduced down to 1.5" (for better flow, less plastic and better economy). A system may use up to fourteen 1.5" flow splitters. This will split the flow in sixteenths, which is the maximum without the addition of a "dipper" distribution box to add surges to the flow (described in the book).
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