It is great question as month after month of water changes can become boring and you want to streamline the process as best you can.
Any powerhead or pump will work and a hose (ie. new garden hose) dedicated to water changes. Obviously the bigger the faster.
I do 40G water changes using a 44G Brute can and old Hagen 802 powerhead to mix the water and pump old water to the bathtub and then new water from the Brute into the tank. Takes about 34-40 minutes.
Currently looking for a large CHEAP submersible pump (eg. Mag 12 or 18, Eheim 1262) to make the process faster.
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