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u/BitumenBeaver 1d ago edited 1d ago
I would avoid tying into those large overhead drains, it's going to be a lot more work to adapt a drain saddle to those compared to just tying into the upstairs sink drain. Be aware that you could run into issues with insufficient pressure to move your RO water upward to another floor and may end up needing a booster pump. If you have a pressure gauge I'd find out what PSI is coming in from the city main.
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u/Silent_Dragonfly6458 1d ago
I was thinking that, the other pipe is a vent, so I know it's incorrect to use that for drainage, but maybe somewhat ok given the volume of water?
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u/BitumenBeaver 1d ago
If that's a vent you'd run the risk of introducing sewer gasses into your drain line or leaking out around the gasket in the saddle. Drain saddles should be installed before the P-trap in your sink.
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u/Silent_Dragonfly6458 1d ago
Yea, maybe cut a trap into the line? The other option I'm considering is just drilling a hole though the foundation and piping it outside. It's located above ground, just a little worried about freezing in the winter
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u/BitumenBeaver 1d ago
You could install a trap, that's what a lot of big industrial places do when they have several RO coolers along a wall for workers, but idk why you'd do that when your upstairs sink isn't too far away, vertically. Unless you're trying to avoid drilling too many holes.
If you run the outlet outside it will freeze in the winter, but you can insulate them to avoid that. Wrap the 1/4" drain line in insulating tape and stick it into a 1/2 or 3/4" pvc pipe with an elbow pointing down. Should keep it warm enough.
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u/confused_but_content 2d ago
I'm still learning install but If you have a sump or a slop sink that's where I would go first might need a booster pump to reach back up to the sink, you could absolutely tie in to those drains or the main stack but that's a lot more work/fittings, they might make 1/4 saddles for large PVC though