Here are some pics of my RO
The first pic is the "T" I got to come off the cold water supply under the sink. It was about $3 at Lowes. The silver supply line coming from that is 1/4" and is 18" long.
The silver supply line connects to another shut off valve so I can control the RO
unit separate from the main waterline going to the sink. Screwed into the shutoff valve is a john guest fitting and then into a clear line that goes into another fitting and into the unit itself.
Hope that helps with the RO
unit install. It's really very simple and there are a lot of different ways to do it. If you print these pictures off and take them to Lowes they should be able to match up the parts I used and you can do something similar.
As for your sump, I'm not a big fan of prebuilt sumps. If you want to look into a custom sump then you need to talk to Marc Levenson. He is in Dallas/Ft Worth so not too far from you. Have a look at his site he builds custom sumps and does an AWESOME job
. If you talk to him tell him I sent you!