It's a big siphon. I stuck the sucking end into my little fish pond/bath, took the other long end and placed it behind the window above (so the goop came OUTSIDE) however I rocked and rocked this thing with both hands and I couldn't get it to come and water went sticky and fish pooped everywhere some came out others started swimming all over my fish water and the connectors also dripped nasty water on me my hands were sore from pumping this thing and I ended up with it to throw it outside and do a water change through the drain plug I can't figure out how to use these things and I think they scare me too a big goldfish. Definitely not for women's hands IMHO. I give up after trying 2 different siphons. i need something electrical It is too much. Work. I'm so discouraged. How come "we" (my 17 year old goldfish and I) have NEVER used any of these stupid things for all these years? I've just used a large Rubbermaid tub (I actually use 3.70 to 200 gallons for my fish) and my goldfish has never been happier than in these fantastic Rubbermaid tubs - Revain sells and supplies them too. Keeping my old man inside doesn't make him or me happy. When I used those Rubbermaid tubs, there were never any. The tubs have an outlet at the bottom for a VERY powerful and quick water change if and when needed. I miss water lilies too. UPDATE ::: March 4, 2014 - Unfortunately, although I've worked so hard to treat Ichthyophthyriasis, my Navy Vet also visited and treated me, but recently noticed that Elvy's scales are protruding while the Vet's only has scales protruding. Left. I was right, this is dropsy aka kidney failure (fatal). I am devastated because I love my goldfish more than anything. :(((((((((
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