I think you have it setup coorectly.
Your clear tubing supplies the water that goes into the sediment cartridge (the one in the far left).
This canister should be plumbed or connected to the second canister that has a carbon block.
From the carbon block cartridge comes out that blue tubing that enters the RO membrane thru the far right side.
Then you have the good water discharge (yellow tubing) that enters the DI cartridge (the one in the far right side), and the then your product (good) water exiting the DI cartridge thru the yellow tubing.
The red tubing should be waste water. Which should not be considered actually waste. You can store this water for human consumption (if you worry about your health, put a drop of chlorine for each litre of water and leave for a couple of days). If you have a pond, throw it there. It can be water for your dogs, to wash your cars, to shower your garden, or even to gravity feed your RO/DI unit again.
It is good water. It already passed thru a sediment filter, and thru a carbon block. It didn't go thru the membrane though.
my 2 cents.!!!
