Where to install waste water connection.

[boxofwater]

Need some help on where to install the waste water from my RODI unit. When watching videos online, it mentions to in the all the waste water above the trap. But unfortunately, both of my sinks do not have this option. Where would I install it on this set up?

 

[rob taft]

Use something like the below. From the sink tailpiece to the trap.

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[Ocelaris]

Other option is a drain saddle valve :

Drain Saddle Clamp - Push Connect

Drain Saddle Clamps directly plumb the waste water line from RO systems to a sinks drain pipe. Two Configurations Available 1/4" Push Connect 3/8" Push Connect Specifications 1/4" hole needed for 1/4" drain saddle clamp 3/8" hole needed for 3/8" drain saddle clamp Max pipe diameter 1.5"...

www.bulkreefsupply.com

 

[theMeat]

This works

Drain Saddle Clamp - Push Connect

Drain Saddle Clamps directly plumb the waste water line from RO systems to a sinks drain pipe. Two Configurations Available 1/4" Push Connect 3/8" Push Connect Specifications 1/4" hole needed for 1/4" drain saddle clamp 3/8" hole needed for 3/8" drain saddle clamp Max pipe diameter 1.5"...

www.bulkreefsupply.com

 

[paintman]

Why over think this? Just stick the dang waste water tube down the drain in the sink about 2 inches. This way you don't have to poke a hole in any of your pipes.

 

[theMeat]

Why over think this? Just stick the dang waste water tube down the drain in the sink about 2 inches. This way you don't have to poke a hole in any of your pipes.

A few reasons that come to mind...
Hose in sink annoying. When you finish using unit and put the hose back in cabinet it way leak and damage cabinet. A new trap or tailpiece is a few bucks to replace if/when you remove the rodi unit.