Originally Posted by CesarNYC
The optional res is kinda dinky, 100ml. The 35x sucks that up in about a second, making it a pita to fill the loop. Not sure if I explained myself clear enough in the OP, but wanted to double the capacity by unscrewing the top of the swiftech res, screw in the male/male EK link, add another EK tube, and top it off with the original lid that came with the swiftech. So you would at the least double your capacity, hopefully making filling the loop a tad easier.
You're doing it the hard way. Get a barb on the top cap, get a hose, and connect a funnel. Slapping on a whole other res just for filling is a long way around the job. After you get the loop filled up, comeback in a week and top off the excess air that's replaced itself with water, which is now in the res.
Personally, after it's filled, I spend 20 mins with a syringe working the air out, but you can do this over the course of a few days like described above.