Ill time my girlfriend next time she does it for me...
Okay. It took me 1:57 minutes to drain the tank outside. About 110g give or take a few . Then it took me 3.43 minutes to fill it back up .
19.4 gpm drain and fill. Not quite 40's but you're still in the lead. Impressive.
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Damn that's crazy! Ill have to do a video on my next water change. I never really thought it was fast. I used to do water changes with a pool hose and a siphon. That was pretty cool lol