I plumbed up a mixing valve and timer with the goal of pumping fresh water into my 300 gallon tank automatically on a daily basis. Sort of a BIG drip.
After I finished it quickly became apparent that it was just as easy to do water changes with my system. I've got a 1" diameter drain line in my tank that runs out the wall and into the woods behind my house. My water changes consist of opening a valve, letting the tank drain down, and then pushing a button on the timer. I can do a 30% water change in about 14 minutes and never get my hands wet! LOL
I figured adding a certain amount of water everyday would give me less dilution than a constant drip but a true water change would give me even FRESHER water. At least it would if I'm thinking about this correctly. ?
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