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Equipment

Siphons, racking canes, hoses and food-grade tubing

How do I move cider off the lees without a pump, and what tubing is safe?

In short

A siphon works because a continuous column of liquid in a tube, with its outlet below the surface of the source, pulls the rest along behind it. No energy input is needed beyond the height difference.

A racking cane is a rigid tube with a standoff tip at the bottom, which holds the intake a centimetre or two clear of the lees so that the cider is drawn without stirring the sediment up.

The tubing is where the risks are. It must be a food-grade material, it must be sized so flow is gentle, and it must be cleanable — or cheap enough to replace, which is usually the more honest answer.

Racking cleanly

The point of racking is to leave the lees behind, and everything about the technique serves that. The source vessel is moved into position and left to settle again for at least a few hours, because carrying it disturbs the bed. The cane goes in slowly and vertically, and is lowered as the level falls rather than being pushed to the bottom at the start. The receiving vessel sits below, and the outlet is put down to the bottom of it so the cider fills from underneath rather than splashing in.

Starting the siphon should not involve a mouth. Sucking on a racking tube introduces oral bacteria and yeasts into the cider, and it is entirely avoidable: an auto-siphon primes itself with a single pump stroke, a filled tube with a thumb over the end starts a siphon cleanly, and a small hand pump or a squeeze bulb does the same job.

Stop before the lees. The last few centimetres of a vessel contain most of the sediment and comparatively little cider, and pulling that through undoes the whole exercise. Where the volume matters it can be settled separately and the clear portion recovered later.

What tubing to use

Common food-grade tubing materials are silicone, food-grade PVC, polyethylene and various thermoplastic elastomers. All are made in food-contact grades and in industrial grades that look identical, and the industrial grades may contain plasticisers and additives not authorised for food contact. Tubing intended for food use is sold as such, with a declaration of conformity behind it; hose bought from a general hardware supplier is not.

Plasticiser migration is the specific concern with flexible PVC. Some plasticisers are lipophilic and migrate into alcohol-containing liquids more readily than into water, and the migration increases with temperature and contact time. Food-grade formulations are authorised on the basis of migration testing; unspecified hose is not.

Silicone tolerates heat, which is what makes it the usual choice where tubing has to be sanitised with hot water or steam or used on a hot-fill line. It is more permeable to gases than PVC, which is immaterial over a transfer and relevant if tubing is left as a permanent connection.

Bore size matters for the reasons a pump’s suction line does. Too narrow a bore makes a transfer slow and turbulent; too wide a bore in a siphon is difficult to prime and hard to control. Fittings should be smooth-bore and hygienic rather than barbed and jubilee-clipped wherever the cider is finished.

The cleaning problem

Tubing is the worst object in a cider house to clean, because it is long, narrow, flexible and opaque, and because nobody can see inside it. A film of cider left in a hose overnight grows an acetic and lactic population within a day in a warm room, and the next transfer runs the whole batch through it.

The workable practice is to flush immediately with water, then circulate a detergent solution, then rinse, then sanitise, then hang the hose vertically to drain and dry rather than coiling it wet. Coiled wet tubing holds pockets of liquid indefinitely.

Tubing is also cheap relative to a batch of cider. Replacing it on a schedule, and replacing it immediately if it has gone cloudy, stiff, sticky or discoloured inside, is a reasonable policy at any scale and an obvious one at small scale. A hose that has carried a spoiled batch is not worth saving.

Gravity is a feature

A siphon applies no shear, generates no heat, draws no air on the suction side if the joints are sound, and cannot cavitate. For a small producer it is not a poor substitute for a pump — for most transfers it is the gentler method, and the only reason to use anything else is that the volume or the geometry makes it impractical.

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