For soda most people use 25-35' long lines. The epoxy mixer sticks go inside of the liquid out diptube in your keg. Just remove the post fitting, and drop them in place. What they do is provide extra resistance, which slows the flow down similar to the way extra long lines do. Even with a diptube full of the epoxy sticks, you'll probably need at least 10' of 3/16 id line, which is likely twice as long as the line that came with your unit.
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