I thought you were using the water outside.
I figured, but it is..........a bit inconvenient. Shower adapter works like a charm, and then the large 3/4" hose drains pretty quick, and you can run that end of the hose outside to water the lawn or landscaping etc. Once drained, you take that end and attach to the shower head, prep the temp, then pull the shower valve to send new water to the tank.
The Hook height for draining can be set for your tanks to any length also, and simply twist to make it more shallow on smaller/shallower tanks.
This pre sets the drain % you do without you even being around. The strainers prevent fish and shrimp getting in and also prevents large high pressure water from destroying the landscaping.
Squirt some dechlor or run through a carbon block prefilter= done deal.
I change 440 Gallons of tank about 70% 1-2x a week in 1.5 hours and clean the prefilters, wipe glass, cleanign sponge block filters, change CO2, trim etc.
The tank takes some time to drain and refill, so I clean and do the other stuff.
The actual work involved in the water change for 5 tanks actually only takes maybe 10-15min tops.