Nine Days Closed: Dosing the Kitchen Before a Holiday Shutdown

The last service before a nine-day closure is the worst bin of the year. A 300-cover Christmas Eve, a kitchen stripped of stock, fridges defrosted, and a walk-in cleared into 140 litres of waste at 01:20. The next collection is 3 January. That is 250 hours, a sealed bin, a building with the heating off, and a manager who will not be there to check.

Shutdown dosing is a different specification from everyday dosing, and the failure is predictable: a normal dose, a bin left indoors at 20 degrees for a week, and a pool of liquid waiting for whoever unlocks the door. This article covers the closing dose, the defrost water problem, what to do with half-used powder, and the reopening check.

The Closing Bin Is a Different Specification

Everyday dosing assumes a 12 to 60-hour hold. A shutdown assumes 250 hours, no supervision and often a building that swings between 8 and 22 degrees. Add 25 to 30 percent to the dose and apply it in two passes, the first when the bin is half full during the clear-out and the second at 80 percent. On a 140-litre load at 13 grams per litre, that takes you from 1.8 kilos to about 2.4.

Remove free liquid before you dose. A clear-out produces a lot of it: defrost water, the dregs of stock pots, the water from blanched vegetables. Skim or decant what is sitting on top into a separate container and dose that separately at 16 grams per litre. Dosing a bin that is half water is how you end up with 2.4 kilos of powder floating on a lake.

Clear the Fridges Into the Bin, Not Down the Sink

A defrosting walk-in produces 20 to 40 litres of water, and the instinct at 01:00 is to send it down the floor drain. That water carries food solids and fat into the grease trap, and a nine-day closure means it sits there fermenting until reopening. Send it to a bucket, let the solids settle, and either dose the bucket or dispose of it under your trade effluent consent.

The clear-out also produces things that should never be gelled: a 20-litre tub of sauce, a catering pack of mayonnaise, a bucket of brine. These are better decanted into a lined bin with an absorbent pad or split across two bins than dumped into one and dosed. Big single additions are the most common cause of a shutdown bin that fails, because they arrive after the dose has set.

What to Do With Half-Used Powder

An open 25-kilo sack left in a kitchen for nine days with the heating off will pull moisture, and by reopening it will be a semi-solid lump. Decant what is left into a sealed 5-kilo tub with a desiccant sachet, tape the lid, and store it off the floor. Do not leave the scoop in the tub; a scoop left in powder is a wick.

Powder that has already clumped is not necessarily lost, but it will not dose accurately. Break it up, use it for non-critical applications such as yard bins, and order fresh for the kitchen. Keep the batch label and the date so you know what you are dealing with on 3 January.

If the Building Will Drop Below Zero

Gel holds water, water expands when it freezes, and a frozen bin can split at the seam or crack at the base. If the building is unheated and the forecast is below freezing for the closure period, either move the bin to a heated space, or leave the load ungelled in a bunded container with a lid and dose it on the first morning back, when you can also see what you are dealing with.

A frozen load is also a rejected load at many haulers, so a bin that freezes solid over the break can cost a lift even if it never leaked.

On reopening day, before anyone tips that bin into a fresh one, open it and look. Firm, no free liquid, no mould beyond a surface skin: it goes straight out. Liquid at the bottom: dose 15 grams per litre on the liquid volume, stir, wait 20 minutes, and check again. Mould and a strong smell: the load is still fine for disposal but should go out first, before the kitchen starts producing again.

Shutdowns are the one time of year when a bin is tested for longer than anyone designed for. If you are planning a closure, send us the dates, the bin volume and whether the building stays heated, and we will spec a closing dose with a margin; the long-hold grades are on the super absorbent polymer powder range.