+1
That valve is for flushing the membrane.

sent u a pm with a diagram and video

I actually found the video very helpful however I have different valve on mine that I might consider throwing out.
http://imgur.com/CooXy6z

Here is my sad candy coral
http://imgur.com/2ZAVF9E

I actually found the video very helpful however I have different valve on mine that I might consider throwing out.
http://imgur.com/CooXy6z
http://imgur.com/CooXy6z

Here is my sad candy coral
http://imgur.com/2ZAVF9E
http://imgur.com/2ZAVF9E

That is a precision type of valve. Forget the name. The last person to install that probably used it as a flow restrictor. If so and if everything else is hooked up properly, then you adjust that valve so that when you get 1 liter of ro water, 4 liters of waste are produced.
Do you have a pic of the other side of the ro membrane housing?

I'll grab some more pictures tonight but I also think my DI cartridges might be screwed

I got the RO unit figured out I believe. A few of the DI canisters are broken and the value is not adjusted properly and it's to tedious to adjust the "EZ-Flush-kit" value back to the appropriate spot after using it to flush. So I am ordering a regular flushkit.

This candy coral is killing me though. Everything else in my tank is perfectly fine except for it.