Interesting responses in here...
I have had the same python for 10 years now, it's 25ft in length and it has never broken, fallen apart, or failed in anyway.
That being said, if you need a lot of suction, you would have to hook it up to your sink and crank up the taps; if you are doing regular maintenance and not over feeding your fish, the actual time you need to clean out debris should be minimal. Once the debris is cleared, you can turn off the taps and the remaining water for your water change will empty just fine.
As to the refill - my tank is a 75g, and I usually change out 50% every 3 to 4 days, so I add 1 cap of Prime on the side that the fish are not on (they don't like the python, so they stay away from it) and then start re-adding tap water to the tank. I use the shut off feature on my Python to control this - set the temp of the water, then turn the shut off knob on the python to close it, then add prime, and open the valve to start the water.
In my honest opinion, some people worry far too much about how to use dechlorinator, how much to use, how to re-add water to the tank, aging water, and so-on. Most fish are pretty hardy, and as long as you don't cause a big temp fluctuation, big PH change suddenly, or keep rinsing all your filter media in tap water so your tank is forever cycling (I have read that too many times here now, if you're doing that, STOP IT!).
I have been keeping fish for almost 15 years now - Discus, catfish, plecos, livebearers, tropical, yadda yadda yadda, but I toned the very expensive hobby down to just my 75g with goldfish.
And just to note something as well... I'm not posting for the fun of it, nor am I 'talking out of my ***' (I didn't have beans either), but the tank I did scale down to contains a fish that is nearing 9 years old, with the other two coming up to 7 years old; I have had them since they were tiny babies. They have never been sick, I have never purchased medicine for them, and the last time I used aquarium salt in my tank was just over 4 years ago when I moved 45 mins and it was added at 0.1% to avoid stress from the move.
Anyway, everyone has a different view of what works for their fish, and what doesn't, but no-one is perfect. Everyone wants what is best for the health of their fish, so rather than tell someone they are doing their water changes incorrectly in a demeaning way, educate them about why most every hobbyist recommends a certain method.
/soapbox off
