Cecil, I use a bell siphon like in the link below, designed for draining waterbeds. I use a 100' garden hose, then spliced in a 3' long "aquarium" style clear siphon tube that is readily available, and adaptable. It wastes some water when creating the full power of the venture action. I normally only started the siphon with the venture, and then let gravity take over. Under full power, I could drain a 150G aquarium completely in about 10 minutes.
Bell Siphon
