I have a pump that pumps around 2800gph hook it up to the tank and then outside and push it out side. I do 100g then I fill it back up with the same pump. I'm to lazy to figure out the math. 2800gph ÷100g = minutes it takes to empty and fill
I don't think I can accept this as an entry. Due to head loss that pump isn't probably anywhere near 2800gph. Just time yourself next time.
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