If your measuring device is not as precise as the number you come up with, it is generally advisable to round the calculated number up to ensure you provide at least the dose you intended to provide. it is always important to provide a 30min contact time after adding the chlorine and mixing, then to test the water to ensure the desired residual has been achieved.
POOL VOLUME CALCULATION (RECTANGULAR POOLS)
FEET 
METRES 
LITRES 
24
x 12 x 4 
7.2
x 3.6 x 1.2 
30,000 
30 x 15 x 4 
9.0 x 4.4 x 1.2 
48,000 
30 x 15 x 4 
9.0 x 4.5 x 1.5 
60,000 
34 x 17 x 5 
10.0 x 5.0 x 1.5 
75,000 
40 x 20 x 5 
12.0
x 6.0 x 1.5 
110,000 
POOL VOLUME CALCULATION (CIRCULAR POOLS)
FEET 
METRES 
LITRES 
12x3 
3.6
x 0.9 
10,000 
15x4 
4.5 x 1. 2 
20,000 
20 x 4 
6.0 x 1.2 
35,000 
25 x 4 
7.7 x 1.2 
45,000 
30 x 4 
9.0 x 1.2 
80,000 
CHEMICAL BALANCE CHART
Recommended
Levels 
Marblesheen
Tiled 
Fibreglass
Resin 
Vinyl
Painted 
PH 
7.48.0 
6.87.2 
7.27.6 
Total
Alkalinity
mg/1 
100150 
80120 
80120 
Total
Hardness
Mg/1 
180250 
180250 
180250 
CHLORINE DOSAGE CHART (This chart is a guide only)DOSE PER 10,000 LITRES
DAILY DOSE

UNSTABILISED POOLS 
Granular
Chlorine 
80 Grams 
Liquid Chlorine 
0,4 litres 
Tablets 
4 Tablets 
DAILY DOSE 
STABILISED POOLS 
Granular Chlorine 
40
Grams 
Liquid
Chlorine 
250mi 
Tablets 
2 Tablets 
DAILY DOSE 
STABILISED LIQUID CHLORINE 
Stabilised Chlorine 
40 Grams 
Granular
Chlorine 
160 Grams 
Liquid Chlorine 
1 Litre 
APPENDIX – I
CHLORINE DOSAGE CALCULATIONS AND MEASUREMENTS
I1. General
Tables I1 and I2 provide volumes in drops (dp), milliliters (mL), teaspoons (tsp), tablespoons (tbls), cups (cp), liters (L), and gallons (gal) of liquid bleach, dry calcium hypochlorite (HTH), and a concentrated calcium hypochlorite solution that, when added to the indicated volume of water, will provide the approximate chlorine dose indicated. The chlorine residual achieved using these values will be dependent on the chlorine demand exerted by the water that is chlorinated. If there is no chlorine demand, the residual should equal the dose. The greater the chlorine demand, the lower the residual will be. Note that for all chlorine residual concentrations in water, values in parts per million (ppm) are equivalent to values in milligrams per liter (mg/L) (for example, 10 ppm = 10 mg/L).
Table I1. Roundedup volumes of 5% liquid bleach that will provide approximately the indicated chlorine dose when added to the listed volume of water
Gallons to be Chlorinated 
1 mg/L 
2 mg/L 
5 mg/L 
10 mg/L 
100 mg/L 
5 
6 dp 
0.75 mL 
1.9 mL 
3.8 mL 
8 tsp 
10 
0.75 mL 
1.5 mL 
3.8 mL 
1.5 tsp 
16 tsp 
25 
2 mL 
3.8 mL 
2 tsp 
4 tsp 
1 cp 
36 
3 mL 
5.5 mL 
2.75 tsp 
2 tbls 
1.25 cp 
50 
4 mL 
1.5 tsp 
4 tsp 
3 tbls 
1.75 cp 
100 
7.7 mL 
3 tsp 
3 tbls 
5 tbls 
3.25 cp 
400 
2 tbls 
4.25 tsp 
0.75 cp 
1.5 cp 
3 qt 
500 
3 tbls 
0.33 cp 
1 cp 
1.75 cp 
1 gal 
1000 
0.33 cp 
0.67 cp 
1.75 cp 
3.25 cp 
2 gal 
Table I2. Volumes of 70% available chlorine HTH (or solution concentrate*) that will provide approximately the indicated chlorine dose when added to the listed volume of water (more accurate volumes are shown in parentheses)
Gallons to be Chlorinated 
1 mg/L 
2 mg/L 
5 mg/L 
10 mg/L 
100 mg/L 
5 
0.9 mL 
1.7 mL 
4.1 mL 
8.3 mL 
0.25 tsp 
10 
1.7 mL 
3.3 mL 
8.3 mL 
16.6 mL 
0.5 tsp 
25 
4.1 mL 
8.3 mL 
20.7 mL 
41.4 mL 
1.25 tsp 
36 
6 mL 
11.9 mL 
29.8 mL 
0.9 mL 
1.75 tsp 
50 
8.3 mL 
16.6 mL 
0.6 mL 
0.25 tsp 
2.5 tsp 
100 
16.6 mL 
33 mL 
0.25 tsp 
0.5 tsp 
5 tsp 
400 
0.92 mL 
1.9 mL 
1 tsp 
2 tsp 
19 tsp 
500 
1.3 mL 
0.5 tsp 
1.25 tsp 
2.5 tsp 
0.5 cp 
1000 
0.5 tsp 
1 tsp 
2.5 tsp 
5 tsp 
1 cp 
I2. Conversion factors
a. Table I3 is useful in converting from one unit of measurement to another. It shows equivalent values for common units of measurement. Unit volumes increase from left to right and top to bottom. All volumes on the same horizontal line (row) are equal. So, looking at the “ounce” row, we can see that 1 oz, 444 dp, 30 mL, 6 tsp, and 2 tbls are all equal to each other. Continuing to the right on the same row indicates that 1 oz is also equal to 0.125 or 1/8th cp (see table I4), 0.063 pints (pt), 0.031 quarts (qt), and so on across the table.
b. If you need to add 7 mL of bleach to a container of water, but you only have an eyedropper, you can see that each mL contains 15 dp, so 7 mL would be equivalent to 7 x 15, or 105 dp.
c. The values moving down a single column represent how many of the units at the top of the column make up one of the units on the left of the table. For example,
proceeding down the column with “drop” at the top, there are 15 dp in a mL, 74 dp in a tsp, 3550 dp in a cp, and a whopping 56,775 dp in a gal. Similarly, looking at the “ounce” column, there are only 0.002 oz in a dp, 0.5 oz in a tbls, and 32 oz in a qt.
Table I3. Equivalent volumes

drop 
mL 
tsp 
tbls 
ounce 
Cup 
pint 
quart 
liter 
gal 
drop 
1 
0.067 
0.013 
0.004 
0.002 





mL 
15 
1 
0.200 
0.067 
0.033 
0.0042 
0.0021 
0.0011 
0.0010 

tsp 
74 
5 
1 
0.333 
0.167 
0.021 
0.010 
0.005 
0.005 
0.001 
tbls 
222 
15 
3 
1 
0.500 
0.063 
0.031 
0.016 
0.015 
0.004 
ounce 
444 
30 
6 
2 
1 
0.125 
0.063 
0.031 
0.030 
0.008 
cup 
3550 
237 
48 
16 
8 
1 
0.500 
0.250 
0.240 
0.063 
pint 
7100 
473 
96 
32 
16 
2 
1 
0.500 
0.480 
0.125 
quart 
14200 
946 
192 
64 
32 
4 
2 
1 
0.960 
0.25 
liter 
15000 
1000 
203 
68 
34 
4.2 
2.1 
1.06 
1 
0.26 
gal 
56775 
3785 
768 
256 
128 
16 
8 
4 
3.785 
1 
I3. Fractions and decimals
Table I4 shows the equivalence between common fractions and decimals.
Table I4. Common fractions and their decimal equivalents
Fraction 
Decimal 

Fraction 
Decimal 
1/16 
0.0625 
9/16 
0.5625 
1/8 
0.125 
5/8 
0.625 
3/16 
0.1875 
11/16 
0.6875 
1/4 
0.25 
3/4 
0.75 
5/16 
0.3125 
13/16 
0.8125 
3/8 
0.375 
7/8 
0.875 
7/16 
0.4375 
15/16 
0.9375 
1/2 
0.500 
16/16 
1.0000 
I4. Chlorination formulas
a. If the volume and/or concentration you are working with are not in the tables above, use the following equations to calculate the volume of required bleach, HTH, or concentrated calcium hypochlorite solution in mL; then use table I3 to convert that volume to enable using the best measuring device you have available.
(1) For Liquid Bleach (~ 5% available chlorine):
mL required = desired concentration in mg/L x number of gallons to be treated
13.2
(2) For HTH (~70% available chlorine)
mL required = desired concentration in mg/L x number of gallons to be treated
434.6
(3) For a solution made from adding 1 level tsp HTH to half a canteen cup of water:
mL required = desired concentration in mg/L x number of gallons to be treated
6.04
For example: chlorinating 10 gallons of water with a dose of 5 mg/L (ppm), would require the following:
5 x 10 = 3.8 mL of bleach
13.2
5 x 10 = 0.115 mL of HTH, or
434.6
5 x 10 = 8.3 mL of concentrated hypochlorite solution made from 1 level tsp HTH in
6.04 half a canteen cup (1 ½ cups) of water.
b. If your measuring device is not as precise as the number you come up with, it is generally advisable to round the calculated number up to ensure you provide at least the dose you intended to provide. For water destined for drinking, it is always important to provide a 30min contact time after adding the chlorine and mixing, then to test the water to ensure the desired residual has been achieved.