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I'm installing iSpring RCC7AK filtration system in a rental apartment so I'd love to minimize impact on existing equipment.

I'm considering 4 locations to connect:

  1. Drill a hole in the cap. I can't use saddle so I guess I'd have to glue the pipe;
  2. Drill a hole on top of the wide tube;
  3. Drill a hole on the side. Too big to use included saddle;
  4. It's drain tube from washing machine.

Currently I'm tempted to go with option (1) because I can easily replace the cap. I like location (4) as well but I wonder if there is a risk contamination of clean water in RO tank when washing machine is draining water.

Where should I connect it? Is there better option that I haven't mention?

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What do the instructions tell you? Are there any warnings about cross contamination?
If not, I would tap into the top of the stub at #2 using the saddle. I don't like having a stub like that because it tends to collect debris but the clean discharge from the RO drain will actually help clear it.
A bigger issue is that S trap! I don't know your location but that's not code compliant anywhere I know of in the US.

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  • Yes, interesting that you mentioned S-trap because I just watched video of Florida man who said exactly that :) I'm temporary in the UK and the trap looks suspect to me too.
    – expert
    Jul 25 at 16:15
  • As per cross contamination iSpring instruction is fairly brief. Perhaps I should email them.
    – expert
    Jul 25 at 16:16
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    If their instructions tell you to tap into an under-sink drain, I'm sure it's fine on top of #2.
    – HoneyDo
    Jul 25 at 16:35

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