My main concern would be complete failure of the water pump, not necessarily insufficient volume. I have my setup arranged so that return flow is visible-the line empties just above reservoir level so that I can see that water is flowing with a glance. Others have posted links to in line flow indicators. Anything to make sure water is flowing. A better quality pump MIGHT be less likely to fail but then again anything can fail so why not have some visible indicator of flow? The thing that I've noticed creating the largest drop in temperature while running has been a good fan blowing across the heads.
Upvote 0