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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 30-min 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 7.4-8.0 6.8-7.2 7.2-7.6 Total Alkalinity mg/1 100-150 80-120 80-120 Total Hardness Mg/1 180-250 180-250 180-250 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 MEASUREMENTSI-1. General
Tables I-1 and I-2 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 I-1. Rounded-up 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 I-2. 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
I-2. Conversion factors
a. Table I-3 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 I-4), 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 I-3. Equivalent volumes
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
I-3. Fractions and decimals
Table I-4 shows the equivalence between common fractions and decimals.
Table I-4. 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
I-4. 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 I-3 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 30-min contact time after adding the chlorine and mixing, then to test the water to ensure the desired residual has been achieved.
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