dosage calculator for swimming pool chemicals

Use this to calculate the amount of chemicals required to dose your pool in order to correct your levels of Chlorine, pH, Total Alkalinity and Calcium Hardness.

Firstly enter your pool measurements to calculate your swimming pool capacity:

Width (feet)
Length (feet)
Depth (feet)
Calculated Pool Capacity (gallons)
Enter your readings here, and the required dose for your size pool will be calculated.
Please note that under NO CIRCUMSTANCES should chemicals be mixed with each other.
Chemicals should be dosed individually and allowed to disperse before adding the next chemical to the pool water.

Please read the Safety Data, and Handling Instructions on each Product label before use.
Chlorine reading
add Chlor Granules (gms)
for SHOCK dosing (grams):
add Chlorine Reducer (grams):

Your Chlorine level is too low.
The recommended level is between 2.0 ppm and 3.0ppm

This can cause:

Inadequate sanitization
Algae growth
Add the recommended dose of Chlorine Granules to your pool water in accordance with the dosing instructions on the product label

Your chlorine level is correct as it is within the recommended range of 2.0 ppm to 3.0 ppm.

Your Chlorine level is too high.
The recommended level is between 2.0 ppm and 3.0ppm.

This can cause:
Unnecessarily expensive sanitizing.
Potential damage to pool cover

Add the recommended dose of Chlorine Reducer to your pool water in accordance with the dosing instructions on the product label.

In practice, it is often best to just allow the chlorine level to naturally drop until it is within the recommended range. Do not allow swimming until the chlorine level has reduced to at least 5ppm.

pH reading
Dose Required pH- (grams)
Dose Required pH+ (grams)

Your pool water pH is too HIGH.
The recommended level is between 7.2 and 7.6

This can cause:

Cloudy water
Inefficient use of chlorine
Deposits of scale
Irritation to eyes and skin of swimmers

Please note that the calculation for required dose of pH- is only an approximation due to the balance between pH and Total Alkalinity.

Add the recommended dose of pH minus to your pool water in accordance with the dosing instructions on the product label. Always add acid to water, never water to acid!

Follow our dosing suggestion and then re-test until the desired pH is achieved.

Your pool water pH is too LOW
The recommended level is between 7.2 and 7.6

This can cause:

Staining to pool surfaces
Etching of metal equipment, grouting and platerwork
Uncomfortable skin and eyes

Add the recommended dose of pH plus to your pool water in accordance with the dosing instructions on the product label.

Follow our dosing suggestion and then re-test until the desired pH is achieved.

pH is correct
Total Alkalinity Reading
Dose Alkalinity + (grams)
The calculated dose should raise Total Alaklinity by 25 ppm. It is not recommended to dose more than this per 24 hours. Dose and re-test after 24 hours.
Dose pH- (grams)

Your pool water Total Alkalinity is too low.
The recommended level is between 80 ppm and 140 ppm
Please note that Total Alkalinity should be raised by no more than 20ppm per day.

This can cause:

Difficulty maintaining the pH, it may easily drift
Possible corrosion

Add the recommended dose of Total Alkalinity Plus to your pool water in accordance with the dosing instructions on the product label.

Your pool water Total Alkalinity is correct.

Your pool water Total Alkalinity is too high.
The recommended level is between 80 ppm and 140 ppm

This can cause:

Difficulty adjusting the pH, it may become fixed
Cloudy water
High pH, and consequent poor chlorine efficiency

Add the recommended dose of Dry Acid (pH minus) to your pool water in accordance with the dosing instructions on the product label.

Calcium Hardness Reading
Dose Hardness + (grams)

Your Calcuim Hardness level is too LOW
The recommended level is between 200 ppm and 300 ppm

This can cause:

Etching of concrete and plaster surfaces
Possible corrosion of equipment

Add the recommended dose of Hardness Plus to your pool water in accordance with the dosing instructions on the product label.

Your pool water Calcium Hardness level is correct.

Your pool water Calcium Hardness is too high.
The recommended level is between 200 ppm and 300 ppm

This can cause:

Cloudy Water
Possible scaling

There is no chemical remedy for this. The only solution is to replace swimming pool water with fresh water that has a lower Calcium Hardness