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Swimming Pool Care help & information, questions answers

How to adjust your pool's pH & Total Alkalinity using Muriatic (liquid) Acid
Good water balance - you can also watch the Video here!

Maintaining proper Total Alkalinity (TA) helps prevent 'pH bounce" when in a range of 80 - 125 ppm.

HIGH TA (over 140 ppm) can cause difficulty in keeping pH in its proper range as well as leading to scaling and certain staining.

Please Note: ParPools.com does NOT recommend the use of Muriatic Acid in Residential Swimming Pools to lower pH & Total Alkalinity because of its very corrosive and frankly dangerous nature. Dry, granular acid such as BioGuard Lo 'n Slo, effectively lower the pH & total alkalinity and it's much safer to use and store in your home.

If you live in an area of "hard water," be sure to have your water tested frequently. Special adjustments will need to be addressed including pH & Total Alkalinity to prevent scaling & damage to your pool & its equipment.

To learn how to Increase the pH or Total Alkalinity, click here.

 

How To Decrease pH using Muriatic Acid

ph = 7.4 - 7.6
 

Drops of acid demand reagent (ADR)

Pool Volume in US Gallons

5,000

7,500

10,000

15,000

20,000

25,000

50,000

100,000

1

5 oz.

7.5 oz.

9 oz.

12 oz.

1 pt

1.25 pt.

1 Qt.

3 Qts.

2

9 oz.

13.5 oz.

18 oz.

25 oz.

1 Qt

1.25 Qts.

3 Qts.

6 Qts

3

14 oz.

20 oz.

27 oz.

27 oz.

1 Qt

1.75 Qts.

4 Qts.

9 Qts.

4

18 oz.

25 oz.

1 Qt.

1.5 Qts.

2 Qts.

2.5 Qts.

5 Qts.

11 Qts

5

23 oz.

27 oz.

1 Qt.

1.75 Qts.

3 Qts.

3.5 Qts.

7 Qts.

3.5 Gal.

6

27 oz.

1.5 qts.

2 Qts.

2.5 Qts.

3 Qts.

4 Qts.

2 Gal.

4 Gal.

7

32 oz.

1.5 qts.

2 Qts.

3 Qts.

4 Qts.

5 Qts.

2.5 Gal.

5 Gal.

8

37 oz.

1.5 qts.

2 Qts.

3 Qts.

4 Qts.

5 Qts.

2.5 Gal.

6 Gal.

9

41 oz.

1.75 qts.

3 Qts.

4 Qts.

5 Qts.

6 Qts.

3 Gal.

6.5 Gal.

10

46 oz.

1.75 qts.

3 Qts.

4.5 Qts.

6 Qts.

1.75 Gal.

3.5 GAL

7 Gal.

*Note:  If your swimming pool requires more than 5 drops of ADR to reach the desired pH level, add the amount indicated for 5 drops ADR and retest the next day. DO NOT test sooner. The chemicals need to properly circulate thoroughly
This will help prevent over-treating a pool if you make a mistake & getting on a pH see-saw.

 

How To Decrease Total Alkalinity using Muriatic Acid

Proper TA = 80 - 140 ppm
 

Desired decrease in PPM

Pool Volume in US Gallons

5,000

7,500

10,000

15,000

20,000

25,000

50,000

100,000

10

0.8 pts.

1.5 pts.

0.8 Qts.

1.25 Qts.

1.6 Qts.

2.0 Qts.

1 Gal.

2 Gal.

20

1.60 pts.

1.0 Qt.

1.6 Qts.

2.25 Qts.

3.2 Qts.

1.0 Gal.

2 Gal.

4 Gal.

30

1.2 Qts.

1.75 Qts.

2.4 Qts.

3 Qts.

1.2 Gal.

1.5 Gal.

3 Gal.

6 Gal.

40

1.6 Qts.

2.5 Qts.

3.2 Qts.

3.5 Qts.

1.6 Gal.

2 Gal.

4 Gal.

8 Gal.

50

2.0 Qts.

3 Qts.

1.0 Gal.

1.5 Gal.

2.0 Gal.

2.5 Gal.

5 Gal.

10 Gal.

*Note: Do not add more than 1 quart of acid per 10,000 gallons of water at one time.  If the pool requires more than 1 Quart of Muriatic Acid per 10,000 gallons of water, add the maximum amount then retest 12 - 24 hours later and make further adjustments.  This will help prevent over-treating the pool.

All dosages are approximate. Remember to retest the Total Alkalinity the following day, letting the filter run continuously for 24 hours & adjust as necessary.   Learn about the importance of Good Water Balance here.

US Water Hardness Map

If you still need help, here's how to reach us:

Telephone (during store hours): Shelton  203-377-0100
Email: techhelp@parpool-spa.com

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