Front-of-House Trays and Back-of-House Bins: Splitting the Collection Routine

Between 12:00 and 14:30 a 140-cover restaurant produces two different waste streams. Front of house sends back 22 litres of plate scrap, sauce and half-finished drinks in bus tubs. Back of house sends 85 litres of prep trim, blanching water, stock skimming and mop water. Both reach the same yard twenty minutes apart, and both get the same scoop from the same tub. One stream is cold, acidic and carries broken glass; the other is warm, fatty and layered. Treating them identically is why the yard smells by Thursday.

This piece separates the two routines. It covers what each stream actually contains, the dose each needs, the handover moment that decides whether either gets dosed at all, and a colour system that still works after half the team has changed.

Front of House: Small Volumes, Wide Variation

Plate waste is mostly water locked inside food and a thin liquid fraction of sauce, dressing, stock and drinks. It is cold, which slows hydration, and it is acidic, because vinegar, citrus and soft drinks push pH down to 4 or below. It also carries things you do not want in a gel: glass shards, cocktail picks, napkins, sometimes cutlery. Dose at 6 to 9 grams per litre and do not expect a hard block; a soft, scoopable set that stops the tub sloshing on the trolley is the realistic target. Anything firmer wastes powder, because front-of-house waste is rarely stored longer than one shift.

The bigger issue is what gets poured in. A bus tub that receives a litre of leftover beer and a litre of water from a melted ice bucket has doubled its free liquid without adding any food. Staff should tip drinks down the bar sink and shake ice out before the tub goes back. Two minutes at the station saves 40 grams of polymer per tub.

Back of House: One Hot Layer Over a Cold One

The 85 litres from the back of house are usually stratified. At 21:50 someone pours a stock pot of near-boiling braising liquid into a bin already holding cold trim, and it sits on top as a hot layer with a fat cap. Dose that bin immediately and the polymer hydrates in the hot layer, forms a crust and seals the cold layer underneath. The bin then passes a visual check and fails at the hauler.

Two changes fix it. First, stock and braising liquid goes into a 20-litre cooling pot on the floor, not straight into the bin, and is added once it is below 50 degrees. Second, the bin is dosed in two passes with a paddle, which breaks the fat cap and lets the powder reach the lower layer. Back-of-house bins generally want 12 to 15 grams per litre because of the fat and the depth.

The Handover Hour: Three Questions on One Card

Most missed doses happen in the twenty minutes between the kitchen closing and the last person leaving, when the bin is full, the store is locked and nobody owns the task. A one-card handover fixes this better than a training session. Three questions, answered by initials: has the bin been dosed, has the lid been clipped, has the bin been moved off the hot wall. The card lives on a hook by the dock and is signed by whoever locks up, not by whoever is senior.

It helps to make the dosing point the same place as the bin. A 5-kilo sealed tub on the dock, next to the paddle, gets used. The same powder in a 25-kilo sack in a dry store forty metres away, behind a door that needs a key, does not. In one site we looked at, moving the tub cut missed doses from six a week to under one, with no change to the dose itself.

Colour Coding That Survives Seventy Percent Turnover

Verbal instructions do not survive a kitchen with 70 percent annual staff turnover. Colour does. Blue scoop, blue card and blue caddy for front of house; red scoop, red card and red bin for back of house. The cards show one line each: blue, one sachet per caddy, stir, lid. Red, half at half full, half at eighty percent, paddle each time. New starters learn it in a shift because there is nothing to remember beyond the colour in front of them.

Front-of-house and back-of-house waste are not the same problem, and one dose card for both is how yards end up with slopping bins and over-dosed caddies in the same week. Send us your two stream volumes and service times and we will write a split routine for your site; the absorbency grades behind both doses are on the SAP powder product range page.