Update: I've done it!... and it works. Thanks Guys!
Siphon Indeed works!
How can I pump this unclean water from our 2nd floor to 1st floor down to our drainage?
I keep accumulating a lot of water (enough to fill a water basin) every 2 days from washing stuff.
I'm thinking of using some kind of Hose to transfer it. I've heard of 'Siphon' method, but to do that, I have to go to 1st floor and suck the hose a bit, which I don't want to. The water is unclean.
I don't even know if 'siphon' will work in a 15 foot hose.
Or maybe use water pump. But I'm not sure what pump will I need. Are there any cheap water pumps out there that cost only around $10? water pumps that I see are a bit expensive.