Adjusting pH

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

Precautions

A pH range of 7.2 - 7.8 is ideal for pools and spas. Since 7.5 is the midpoint of this range, we have provided the tables below to help in adjusting up or down to this pH. After testing the pH, find the pH in the left hand column and match this with the volume of water in your pool or spa, listed at the top of the table. Since the recommendations are approximate, you may wish to initially add slightly less and wait 4-8 hours to retest the water. Keep in mind that pH adjustments will affect alkalinity.

Lowering pH to 7.5 with Muriatic Acid
Notes:

Treatment recommendations are affected by total alkalinity. At low alkalinity levels less acid may be required and at higher alkalinity levels more acid may be required.

Starting from 100 Gallons 1,000 Gallons 5,000 Gallons 10,000 Gallons 20,000 Gallons 50,000 Gallons
pH Tsp Pts oz Pts oz Pts oz Pts oz Pts oz
7.6 - 7.8 0.75 0 1.3 0 6.4 0 12.8 1 9.6 4 0
7.8 - 8.0 1 0 1.9 0 9.6 1 3.2 2 6.4 6 0
8.0 - 8.4 1.5 0 2.6 0 12.8 1 9.6 3 3.2 8 0
>8.4 2 0 3.2 1 0 2 0 4 0 10 0
Metric:

Starting from

400 Liters

4000 Liters

20000 Liters

40000 Liters

80000 Liters

200000 Liters

pH

liters

mL

liters

mL

liters

mL

liters

mL

liters

mL

liters

mL

7.6 - 7.8

4

0

41

0

200

0

400

0

800

2

0

7.8 - 8.0

6

0

59

0

300

0

600

1

200

3

0

8.0 - 8.4

8

0

81

0

400

0

800

1

600

4

0

>8.4

10

0

100

0

500

1

0

2

0

5

0


Lowering pH to 7.5 with Dry Acid (Sodium Bisulfate)
Notes:

Treatment recommendations are affected by total alkalinity. At low alkalinity levels less acid may be required and at higher alkalinity levels more acid may be required.

Starting from 100 Gallons 1,000 Gallons 5,000 Gallons 10,000 Gallons 20,000 Gallons 50,000 Gallons
pH Tsp Lbs oz Lbs oz Lbs oz Lbs oz Lbs oz
7.6 - 7.8 1 0 1.6 0 8 0 16 1 12 5 0
7.8 - 8.0 1.5 0 2.4 0 12 1 4 3 8 8 0
8.0 - 8.4 2 0 3.2 0 16 1 12 4 4 10 0
>8.4 2.5 0 4 1 0 3 0 5 0 13 0
Metric:

Starting from

400 Liters

4000 Liters

20000 Liters

40000 Liters

80000 Liters

200000 Liters

pH

Kg

g

Kg

g

Kg

g

Kg

g

Kg

g

Kg

g

7.6 - 7.8

0

5

0

48

0

240

0

480

0

840

2

400

7.8 - 8.0

0

7

0

72

0

360

0

600

1

980

3

840

8.0 - 8.4

0

10

0

96

0

480

0

840

2

40

4

800

>8.4

0

10

0

120

0

480

1

440

2

400

6

240


Raising pH to 7.5 with Soda Ash
Notes:

Treatments in low alkalinity waters require less soda ash while treatments in high alkalinity waters may require more soda ash.

Starting from 100 Gallons 1,000 Gallons 5,000 Gallons 10,000 Gallons 20,000 Gallons 50,000 Gallons
pH Tsp Lbs oz Lbs oz Lbs oz Lbs oz Lbs oz
7.2 - 7.4 0.4 0 0.6 0 3.2 0 6.4 0 12.8 2 0
7.0 - 7.2 0.6 0 1 0 4.8 0 9.6 1 3.2 3 0
6.8 - 7.0 0.8 0 1.3 0 6.4 0 12.8 1 9.6 4 0
<6.7 1 0 1.6 1 0 1 0 2 0 5 0
Metric:

Starting from

400 Liters

4000 Liters

20000 Liters

40000 Liters

80000 Liters

200000 Liters

pH

Kg

g

Kg

g

Kg

g

Kg

g

Kg

g

Kg

g

7.2 - 7.4

0

2

0

18

0

96

0

192

0

384

0

960

7.0 - 7.2

0

3

0

30

0

144

0

288

0

576

1

440

6.8 - 7.0

0

4

0

39

0

192

0

384

0

768

1

920

<6.7

0

5

0

48

0

254

0

480

0

960

2

400