Chemical Dose & Cost Calculators

In construction water treatment, dose rates of coagulants and flocculants are most commonly expressed in ppm (parts-per-million). One ppm is one part by weight, or volume, of a substance added to the water in one million parts by weight, or volume, of the final solution. 

Keeping track of the dose rates in water treatment is important. Making sure that chemicals are not "overdosed" will not only prevent the waste of the product but also minimize the residual load discharged into the environment. And, during budget preparation, the information about the expected range of dose rates or cost in $/m3 will allow for much more accurate cost projections.

Calculator 1 - Dose Rate & Chemical Treatment Cost in $/m3

Input your daily, weekly or monthly volume of water pumped and treated and volume of chemical consumed in the same period of time to calculate the actual chemical dose rate in ppm. Enter your chemical unit price and calculate the actual treatment cost per cubic meter of water. 

Volume of water treated

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Volume of chemical consumed 

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Chemical unit price, $

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Actual dose rate:

ppm

Actual cost per m3:

$/m3

Where can you find the information for your inputs?

- volume of water treated can be obtained from a flow meter or a Flowlink online flow and water quality monitoring system.

- volume of chemical consumed  can be easily and accurately estimated using a measuring tape (see example below). 

Example (using 275 gal tote).

1. Measure the height of the remaining chemical in the tote. 
2. Divide this number by the height corresponding to a full tote (46") and multiply by 275 gal (volume of the full tote) to get the number of gallons remaining on site.

3. Subtract the number of gallons remaining on-site from the full tote volume to calculate the amount of chemical consumed.


Week 1: height: 40" => 40/46 * 275 gal = 239 gal, so 36 gal were consumed in Week 1 ( = 275 gal - 239 gal)
Week 2: height: 35" => 35/46 * 275 gal = 209 gal, so 66 gal were consumed in Weeks 1 & 2 ( = 275 gal - 209 gal), and 30 gal were consumed in Week 2 ( = 239 gal - 209 gal)

Calculator 2 - Total Chemical Treatment Cost

Input your volume of water, dose rate, and chemical unit cost to estimate your total chemical cost

Volume of water to treat

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Dose rate

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Chemical unit price, $

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Chemical cost:

$

Where can you find the information for your inputs?

- volume of water to treat is a projection based on the site-specific rainfall data and/or groundwater infiltration. 

- dose rate can be obtained from a jar test or a water treatment provider supplying and/or using the chemical.

Calculator 3 - Hourly Chemical Consumption & Treatment Cost

Input your feed flow rate, dose rate, and chemical unit cost (optional) to estimate your hourly chemical consumption in gallons per hour or $. 

Feed flow rate

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Dose rate

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Chemical unit price, $

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Hourly consumption:

GPH

Hourly cost:

$/hour

Where can you find the information for your inputs?

- feed flow rate can be obtained from a flow meter or a Flowlink remote flow and water quality monitoring system. 

- dose rate can be obtained from a jar test or a water treatment provider supplying and/or using the chemical.

Calculator 4 - Actual Chemical Dose Rate

Input your feed flow rate and hourly chemical consumption to calculate your actual chemical dose rate.

Feed flow rate

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Hourly consumption

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Actual dose rate:

ppm