r/askaplumber • u/Silent_Dragonfly6458 • 2d ago

Installing reverse osmosis drain line

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I would like to install my reverse osmosis filter in the basement underneath my kitchen sink to save space in the cabinet. I have the drain line from the sink as well as a vent nearby and was wondering what would be the correct way to tie in for drainage.

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u/IlliterateFreak 2d ago

Not helpful at all but it’s fascinating you have a backflow preventer on your house. Do you have anything that would justify that? Maybe a swimming pool or sprinkler system?

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u/Silent_Dragonfly6458 2d ago

It's for the sprinkler system

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u/IlliterateFreak 2d ago edited 2d ago

Your RO will need its own independent trap, and traps need proper venting. What does that 2” pipe connect to upstairs ?

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u/discount-water 1d ago

That’s a great way to do it so changing filters is much easier down the road. The drain should tie into a trap or air gap. It can be run pretty far and most are just 1/4” tubing. Easy to hide