You want to have the suction end of the siphon just above the sediment at the bottom of the fermenting vessel. The best way to do this is to have a length of glass tube (H in. bore) with a U-bend at one end, to bring the lower opening of the tube some % in. above the bottom of the U. This tube, with your polythene piping fitted at the other end can be pushed straight down into the vessel till the U-bend rests on the bottom. The opening will then be sucking up the brew just above the level of the sediment. A chemist will do this bit of glass-work. Failing that, you can buy a good adjustable siphon ready-made.

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