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Sanitation: clean, sanitised, and why it decides the batch

Why does everyone say cleaning matters more than anything else?

In short

Cleaning removes soil — pomace, lees, tartrate, protein and the biofilm growing in it. Sanitising reduces the number of viable organisms on a surface that is already clean. They are two separate operations and the second does not work without the first.

The reason it matters so much is arithmetic. A cider maker cannot sterilise a batch, so fermentation is a competition; whatever population is present at the start has a head start, and equipment is where that population lives between seasons.

The faults that end up blamed on yeast, on fruit or on luck — vinegar, mousiness, ropiness, film growth, a batch that never tasted right — are very often traceable to a hose, a tap, a pump or a bucket.

Clean is not sanitised, and sanitised is not sterile

A clean surface is one from which visible and invisible soil has been removed, so that the surface itself is exposed. A sanitised surface is a clean surface on which the number of viable microorganisms has been reduced to a level considered acceptable. A sterile surface has none, and outside a laboratory or an autoclave, nothing in a cider house is sterile.

The order is not negotiable. Soil physically shields organisms from a sanitiser and chemically consumes it: organic matter reacts with oxidising sanitisers and neutralises them before they reach anything alive. A sanitiser applied to a dirty surface is a sanitiser wasted, and the resulting confidence is worse than no treatment at all.

Biofilm makes this sharper. Organisms on a wet surface that is never properly cleaned build a polysaccharide matrix, and organisms inside a mature biofilm are dramatically more resistant to sanitisers than the same organisms free in solution. Biofilm is removed by chemistry and mechanical action, not by dosing more sanitiser.

The factors that make cleaning work

Cleaning is conventionally described by four interacting factors: time, mechanical action, chemical concentration and temperature. They trade against each other. A hotter, stronger solution needs less time; a longer soak compensates for a lower temperature; scrubbing does what chemistry alone would take much longer to do. What cannot be done is to remove all four and expect a result, which is what a quick rinse with cold water amounts to.

This is why a rinse immediately after use is worth more than a thorough clean the next day. Fresh soil is soft, water-soluble and has no biofilm; the same soil dried onto a surface overnight needs an order of magnitude more effort.

It is also why surface condition matters. A scratched plastic bucket, a rough weld, a threaded fitting, a worn tap, a hose that has gone cloudy inside — all of these hold soil below the reach of mechanical action, and no amount of chemistry compensates for a surface that cannot be cleaned.

Where the organisms actually live

A workable routine at small scale

Rinse everything the moment it stops being used. Then wash with a detergent suitable for the surface, with physical action — a soft brush, never an abrasive pad on plastic or stainless. Rinse thoroughly, because detergent residue taints and because some sanitisers are deactivated by alkaline residue. Then sanitise, following the product’s own instructions for concentration, contact time and whether it needs rinsing. Then drain and dry, or use immediately while still wet.

The routine only works if it is universal. A perfectly sanitised fermenter filled through an unclean funnel is an unclean fermenter, and the funnel is exactly the object people forget. The useful discipline is to treat everything that will touch the cider — including the hydrometer, the trial jar, the thermometer probe, the spoon and the hands — as part of the same system.

None of this eliminates organisms; it reduces the starting population so that the yeast the maker wants can establish and dominate. That is a realistic goal and it is enough. Chasing sterility in a farm building is not, and the effort is better spent on the things above.

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