I have purchased a Whirpool Reverse Osmosis Water Filter which installs under the sink. I am trying to install it and have run into an issue with the drain: the revers osmosis filter has a red tube which needs to be connected to the drain of the sink, so that the waste water from the RO system can be disposed of. The RO filter kit comes with an adaptor to install the drain, and the manual says that for a double-barrel sink (which is what I have, the drain should be installed as follows:
However, I don't have enough room to install the drain adapter in the location they indicate (I have added a freehand circle for clarity). Here is an actual picture from under my sink:
The inset in the bottom right shows the drain adapter (on perfect proportion to the rest of the image). As seen in the indicated areas, the drain adapter, if installed under the right sink, is too tall and I will be unable to connect the right sink's drain to the P-trap.
How else can I install the drain for my reverse osmosis water filter? Can I somehow hook it up to the drain from the dishwasher? What is the cheapest and easiest way to install this RO filter without hiring a plumber?
EDIT: To clarify, I want to do this in a non-destructive way if possible. I.E. no cutting the existing pipes :-) I need to be able to remove the filter and restore the plumbing back the way it was if I move out.