Pump for filling aquarium

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Oh my gosh - the water tank on the truck sounds freaking awesome! I work for a chemical company, so I get my RO/DI water free and when I filled this 90 Gallon up, I just brought it home in two poly drums but I had to schlepp it down the stairs with pails using a drum pump. Now I just get 5 gallon pails filled since four fit in my car - might take a few trips but what is a little bit of gas in the scheme of free water?

Thanks for all the suggestions - that's so helpful!