Adjusting Alkalinity

It is recommended that dry chemicals first be mixed into a generous amount of pool water in increments of about two pounds, and the predissolved mixture be distributed evenly around the pool unless directed otherwise.

Precautions

Alkalinity should be 80-120 ppm. Once you determine the alkalinity, calculate how much you wish to raise or lower it and find this number in the left-hand column. Match this with the volume of water in your pool or spa, listed at the top of the table. Add the recommended amount to the water in small increments. Since alkalinity adjustments affect pH, you should test the alkalinity and pH 4-8 hours after the chemicals are added.

Lowering Alkalinity with Dry Acid
Notes:

Be sure to note chemical precautions above. Always follow manufacturer’s recommendations.

  100 Gallons 1,000 Gallons 5,000 Gallons 10,000 Gallons 20,000 Gallons 50,000 Gallons
ppm Tsp oz Lbs oz Lbs oz Lbs oz Lbs oz Lbs oz
10 1.8 0 3 1 0 2 0 4 0 10 0
20 3.5 0 6 2 0 4 0 8 0 20 0
30 1.0 0 10 3 0 6 0 12 0 30 0
40 1.3 0 13 4 0 8 0 16 0 40 0
50 1.6 1 0 5 0 10 0 20 0 50 0
60 2 1 3 6 0 12 0 24 0 60 0
70 2.2 1 6 7 0 14 0 28 0 70 0
80 2.6 1 10 8 0 16 0 32 0 80 0
90 3 1 13 9 0 18 0 36 0 90 0
100 3.2 2 0 10 0 20 0 40 0 100 0
Metric:
 

400 Liters

4000 Liters

20000 Liters

40000 Liters

80000 Liters

200000 Liters

ppm

Kg

g

Kg

g

Kg

g

Kg

g

Kg

g

Kg

g

10

0

10

0

100

0

480

0

960

1

920

4

800

20

0

20

0

190

0

960

1

920

3

840

9

610

30

0

30

0

290

1

440

2

880

5

760

14

410

40

0

40

0

380

1

920

3

840

7

690

19

210

50

0

50

0

480

2

400

4

800

9

610

24

20

60

0

60

0

580

2

880

5

760

11

530

28

820

70

0

70

0

670

3

360

6

720

13

450

33

620

80

0

80

0

770

3

840

7

690

15

370

38

430

90

0

90

0

860

4

320

8

650

17

290

43

230

100

0

100

0

960

4

800

9

610

19

210

48

30


Lowering Alkalinity with Muriatic Acid
Notes:

Be sure to note chemical precautions on the previous page. Always follow manufacturer’s recommendations.

  100 Gallons 1,000 Gallons 5,000 Gallons 10,000 Gallons 20,000 Gallons 50,000 Gallons
ppm Tsp oz Pts oz Pts oz Pts oz Pts oz Pts oz
10 1.5 0 2.5 0 13 1 10 3 4 8 2.5
20 3 0 5 1 10 3 4 6 8.5 16 0
30 5 0 8 2 7 4 14 9 12.5 24 0
40 1 0 10.5 3 4 6 8.5 13 0.5 32 0
50 1.3 0 13 4 1 8 2.5 16 0 40 0
60 1.6 0 15.5 4 14 9 12.5 19 0 48 0
70 1.8 1 2 5 11 11 6.5 22 0 57 0
80 2 1 5 6 8.5 13 0.5 26 0 65 0
90 2.4 1 7.5 7 5.5 14 10.5 29 0 73 0
100 2.7 1 10 8 2.5 16 4.5 32 0 81 0
Metric:

Starting from

400 Liters

4000 Liters

20000 Liters

40000 Liters

80000 Liters

200000 Liters

ppm

liters

mL

liters

mL

liters

mL

liters

mL

liters

mL

liters

mL

10

0

10

0

80

0

410

0

810

1

630

4

70

20

0

20

0

160

0

810

1

630

3

260

8

140

30

0

20

0

240

1

220

2

440

4

890

12

220

40

0

30

0

330

1

630

3

260

6

520

16

290

50

0

40

0

410

2

40

4

70

8

140

20

360

60

0

50

0

490

2

440

4

890

9

770

24

430

70

0

60

0

570

2

850

5

700

11

400

28

500

80

0

70

0

650

3

260

6

520

13

30

32

580

90

0

70

0

730

3

660

7

330

14

660

36

650

100

0

80

0

810

4

70

8

140

16

290

40

720


Raising Alkalinity with Sodium Bicarbonate
Notes:

Be sure to note chemical precautions. Always follow manufacturer’s recommendations.

100 Gallons 1,000 Gallons 5,000 Gallons 10,000 Gallons 20,000 Gallons 50,000 Gallons

To Raise ppm

Tsp oz Lbs oz Lbs oz Lbs oz Lbs oz Lbs oz
10 1 0 2 0 11 1 7 2 13 7 1
20 2 0 5 1 7 2 13 5 10 14 1
30 4 0 7 2 2 4 4 8 7 21 2
40 5 0 9 2 13 5 10 11 4 28 2
50 6.5 0 11 3 8 7 1 14 1 35 3
60 1.4 0 14 4 4 8 7 16 14 42 3
70 1.6 0 16 4 15 9 14 19 11 49 4
80 1.8 1 2 5 10 11 4 22 8 56 4
90 2 1 4 6 5 12 11 25 5 63 5
100 2.3 1 7 7 1 14 1 28 2 70 5
Metric:
 

400 Liters

4000 Liters

20000 Liters

40000 Liters

80000 Liters

200000 Liters

ppm

Kg

g

Kg

g

Kg

g

Kg

g

Kg

g

Kg

g

10

0

10

0

70

0

340

0

670

1

340

3

360

20

0

10

0

130

0

670

1

340

2

690

6

720

30

0

20

0

200

1

10

2

20

4

30

10

80

40

0

30

0

270

1

340

2

690

5

380

13

440

50

0

30

0

340

1

680

3

360

6

720

16

800

60

0

40

0

400

2

20

4

30

8

60

20

160

70

0

50

0

470

2

350

4

700

9

410

23

520

80

0

50

0

540

2

690

5

380

10

750

26

880

90

0

60

0

600

3

20

6

50

12

100

30

240

100

0

70

0

670

3

360

6

720

13

440

33

600