A 42-bed residential home budgeted £3.80 per resident per month for urine gelling and spent £9.60. The finance officer found it in month seven, by which time the overspend was £1,460 and the manager was being asked to explain a line item nobody had modelled properly. The powder was not the problem. Two lines were missing from the model, and both were obvious in hindsight.
This is the arithmetic, worked through in the open, so that a site can substitute its own numbers and see where its figure will land.
Step one: doses per resident-day
Count actual gelled containers, not toilet visits. In a residential home with moderate dependency, the figure is usually 2.6 to 3.5 per resident per day: a morning commode, an afternoon toilet assist, an evening bedpan, plus the occasional night. In a nursing home with higher dependency it runs 4 to 5.5.
Take 3.1 doses per resident-day across 42 residents and 30.4 days: 3,958 doses a month. Round to 3,900.
Step two: grams per dose
Average volume per container in this setting is 280 to 320 ml, which needs 7 to 8 g at normal concentration. Call it 8 g.
3,900 doses × 8 g = 31.2 kg of powder a month.
Step three: the powder line
Bulk at £8.50 per kg gives £265 a month, or £6.31 per resident. Sachets at 9p each give £351, or £8.36 per resident. That is the number most quotes are built on, and it is where the modelling usually stops.
| Line | Bulk tub | Sachets |
|---|---|---|
| Powder, 3,900 doses | £265 | £351 |
| Measured over-dose, 22% | £58 | £0 |
| Caked or spoiled stock, 9% | £24 | £0 |
| Scoops and storage jars | £9 | £0 |
| Spill and leak incidents, 1.4/yr | £21 | £6 |
| Total per month | £377 | £357 |
| Per resident per month | £8.98 | £8.50 |
Note what happened. The cheaper powder is not cheaper at all once the over-dose and the spoiled stock are counted, and the two formats land within 6 percent of each other. That is a common result, and it is why the format argument should be settled on control rather than on price per kilo.
The two hidden lines
The first is the night dose. Homes that model from daytime observations miss the 22:00 to 06:00 period entirely, and in a nursing home that can be 20 percent of all doses. If the model says 3.1 doses per resident-day but the logbook says 3.8, the difference is almost always nights.
The second is the commode liner. Many homes dose the liner as well as the pan, because the liner is what goes in the bin. That doubles the dose for commode use without appearing anywhere in the plan. On a home with heavy commode use, it can add 15 percent to the monthly total.
What is not worth counting
Staff time is the line everyone wants to add and it rarely changes the decision. Dosing takes eight to twelve seconds with bulk and four to six with a sachet. Across 3,900 doses that is roughly nine hours a month saved by sachets — less than half a shift, and it disappears into the general rhythm of care work. Include it if the finance team insists, but do not let it drive the choice.
Bin weight is worth counting for a different reason. Thirty-one kilos of powder binds roughly 3,900 litres of urine, which at 1.02 kg per litre is about 4 tonnes of water a month. That water leaves the building in bags and bins, and every kilogram of it is being lifted, wheeled and charged for. Reducing dose per container by a gram is worth more in handling terms than most people expect.
Working the sum for a different site
Three inputs decide the answer: doses per resident-day, grams per dose, and the price per kilogram at the delivered quantity. A 60-bed nursing home at 4.6 doses per resident-day and 9 g per dose needs 75 kg a month, which crosses most suppliers’ price breaks and drops the per-kilogram cost by 10 to 15 percent. A 20-bed home at 2.9 doses needs 18 kg, cannot reach the break, and will find sachets more competitive than the arithmetic above suggests.
The useful discipline is to reconcile monthly: kilos in, doses logged, kilos left. A variance over 12 percent means either the count or the dose is wrong, and both are cheap to fix once they are visible. Most homes that move from a guessed figure to a reconciled one find they were spending 30 to 60 percent more than the plan, and that the plan was the thing that was wrong. powder pricing at delivered volumes is the input that moves the total most, so get it in writing before the model is signed off.
Da maohua
Zhengzhou Flor New Materials Co., Ltd. specializes in SAP super‑absorbent polymer products. Serving personal hygiene, agriculture & horticulture, pet supplies and other industries, we leverage supply‑chain resources to provide particle‑size selection, performance matching and customized solutions based on clients’ practical requirements.
