Calculating Economy and Cost of Use with Concentrated Alconox Cleaners
First look at the detergents' use directions to see the recommended dilution for the detergent concentrates you wish to compare. Compare the cost of making up the same amount of cleaning solution (a gallon or a liter of diluted cleaner).
- Cost per diluted gallon = (oz/gal dilution * cost/oz of concentrate)
Calculate the cost per ounce of concentrate, per g or per ml by:
- Cost per ounce = Cost per container/ounces per container
See the table below to translate the directions into oz./gal. dilution.
- Detergent A costs $16.00 for 4 lbs ($4/lb) of cleaner that is diluted 1% to make up a cleaning solution.
- Detergent B costs $9.00 for 3 lbs ($3/lb) of cleaner that is diluted 2% to make up cleaning solution
- Cost per diluted gallon A = (1.25 oz A * $16.00/(4 * 16 oz.) = $0.31 per gallon of dilute A
- Cost per diluted gallon B = (2.5 oz B * $9.00/(3 * 16oz.) = $0.47 per gallon of dilute B
- Detergent A is almost 1.5 times as economical to use as Detergent B even though it costs 33% more per lb.
To work in metric units, the following relationships apply:
- Cost per diluted liter = ml/liter dilution * cost per ml of concentrate or g/liter * cost per g of concentrate
See the table below to translate the directions into ml/l or g/l dilutions.
- Cost per ml = cost per container/ml per container
- Cost per g = cost per container/g per container
wdt_ID % dilute Mix Ratio Oz. cleaner add to make gal of sol’n g or ml add to make liter of solution Gallons sol'n per lb. powder Gallons sol'n per gal. conc. Liters of sol'n per kg powder Liters of sol'n per liter conc. Quantity use compared to a 1% cleaner 1
5 g or ml
½ as much
10 g or ml
20 g or ml
2X as much
50 g or ml
5X as much
100 g or ml
10X as much
200 g or ml
20X as much
If you intend to re-use the cleaning solution more than once, the next issue to consider is how much surface area, how many parts, or how many batches will the volume of diluted cleaner clean. If you can determine how many batches of parts your dilute solutions will clean, you can calculate a cost per batch for comparison. In the example above, if a gallon of dilute Detergent A cleans 5 batches and gallon of dilute Detergent B cleans 7 batches then the cost per batch is as follows:
- Cost per batch of Detergent A= $0.31/gal / 5 batches = $0.062/batch
- Cost per batch of Detergent B= $0.47/gal / 7 batches =$0.067/batch
In this case, it is still more economical to use Detergent A, even though it costs more per lb. and it cleans somewhat fewer batches of parts. The main reason Detergent A is more economical is that it is more concentrated than Detergent B.
Another quick way to get a handle on relative detergent economy is to figure out how much dilute solution equal amounts of different concentrated detergents will make. You can consult the chart above to see how this works. In our example, 1 lb. of Detergent A will make 12.8 gallons of dilute cleaner (1 lb * 16 oz/lb / 1.25 oz/gal dilution) as compared with 1 lb of Detergent B will only make 6.4 gallons of dilute cleaner (1 lb * 16 oz/lb / 2.5 oz/gal dilution). A lb of detergent A makes twice as much solution as detergent B. As long as Detergent A does not cost more than twice as much as Detergent B, Detergent A will be more economical to use to make up solution with.