Poolplaza Pool Supplies - Home
 Pool Supplies shopping:  | Pool Filters Pool Pumps Pool Cleaners  |  Pool Heaters  |  Salt Systems  |  Pool Parts 

 

Pool Chemistry> Total Alkalinity:  |  Intro  Testing  |  Adjusting  |  Solution vs. Suspension

Alkalinity - Adjusting

Adjusting Total Alkalinity (TA)  Levels

Adjusting the Total Alkalinity is something that should be done incrementally.  In other words, it is better to make slight adjustments when the TA gets a little high or low than to wait for the TA to get way off and try to adjust it all back at once.

If the TA is way off, we recommend making an adjustment and then retesting it after 24 hours and adjusting again. 

To raise the TA level (and not the pH too), you add Baking Soda (Sodium Bicarbonate).  Baking Soda will also raise the pH of the pool water slightly.  If you need to raise both the pH and TA, then use Soda Ash until the pH comes to the proper level, then use Baking Soda to make further adjustments to the TA if needed.  NOTE:  Soda Ash (Sodium Carbonate) and Baking Soda (Sodium Bicarbonate) are NOT the same thing.

To lower the TA level, you add Muriatic Acid.  It is important that if you want to lower the TA without significantly lowering the pH, you need to pour the acid in the pool directly in one pint shots in the deep end.  By creating pockets of extremely low pH temporarily, you will burn off the alkaline materials in those areas, thus bringing down the Total Alkalinity reading of the pool.

Chemical Adjustment Charts

It is important to use the Acid or Base Demand Procedure to help determine how much chemical you need to add to the pool water to achieve the desired results.

To Raise the TA Level

Check the chart to see how much baking soda is needed to raise the TA level as desired.  Do not attempt to raise it more than about 50 ppm at one time.  If the TA is at or below 50 ppm, be sure to test for metals in solution before adding Soda Ash or Baking Soda to the pool.

To increase TA using Baking Soda

Desired Increase in PPM

Gallonage of pool or spa

1,000

5,000

10,000

20,000

50,000

100,000

10

0.14 lbs 0.7 lbs. 1.4 lbs. 2.8 lbs. 7 lbs. 14 lbs.

20

0.28 lbs. 1.4 lbs. 2.8 lbs. 5.6 lbs. 14 lbs. 28 lbs.

30

0.42 lbs. 2.1 lbs. 4.2 lbs. 8.4 lbs. 21 lbs. 42 lbs.

40

0.56 lbs. 2.8 lbs. 5.6 lbs. 11.2 lbs. 28 lbs. 56 lbs.

50

0.70 lbs. 3.5 lbs. 7 lbs. 14.0 lbs. 35 lbs. 70 lbs.
*Note:  Do not add more than 10 lbs per 10,000 gallons of water at one time.  If the pool requires more than this, add the maximum amount then retest 12 hours later and make further adjustments.  If your TA is 50 ppm or lower, treat for possible metals in solution before adding Baking Soda.

Adding Baking Soda to a Pool

Slurry the baking soda in a bucket and pour the dissolved solution into the pool. 

To Lower the TA Level

Check the chart to see how much acid is required to drop the TA in your pool to the proper level.  Do not add more than one quart of acid per 10,000 gallons at one time.  If more acid than this is needed, then make one adjustment, then retest before making another adjustment.  As always if your readings don't make sense, seek the advice of a professional.

To Decrease TA using Muriatic Acid

Desired decrease in PPM

Gallons of water in pool or spa 

1,000

5,000

10,000

20,000

50,000

100,000

10

2.56 oz.

0.8 pts.

0.8 qts.

1.6 qts.

1 gal.

2 gal.

20

5.12 oz.

1.60 pts.

1.6 qts.

3.2 qts.

2 gal.

4 gal.

30

7.68 oz.

1.2 qts.

2.4 qts.

1.2 gal.

3 gal.

6 gal.

40

10.24 oz.

1.6 qts.

3.2 qts.

1.6 gal.

4 gal.

8 gal.

50

12.80 oz.

2.0 qts.

1.0 gal.

2.0 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 this, add the maximum amount then retest 12 hours later and make further adjustments.  This will help to keep you from over-treating the pool.

Adding Muriatic Acid to Lower TA Level

Add the Muriatic Acid to the pool in one pint shots in the deep end.  Brush the pool afterwards to insure that the acid does not drop down to the bottom and etch the surface since acid is heavier than water.


BEWARE OF THE DANGEROUS NATURE OF THE CHEMICALS YOU ARE HANDLING.  DO NOT MIX ANY CHEMICALS WITH EACH OTHER.  WATCH OUT FOR FUMES.  SOME CHEMICALS GIVE OFF STRONG FUMES THAT CAN CAUSE SERIOUS PERSONAL INJURY IF INHALED IN SUFFICIENT QUANTITIES.  MSDS SHEETS ARE AVAILABLE UPON REQUEST.

 

POOL School - exclusively from POOLplaza.com


Pool Cleaners
Booster Pump Driven
Pressure Side
Suction Side
Self-Contained

Salt Systems!
Benefits
Differences
How It Works
Choosing a System
Maintenance
Troubleshooting
FAQ's
Sizing a System


Pool Pumps
Choosing a Pool Pump
Pump Troubleshooting

Pool Filters
Sand Filters
DE Filters
Cartridge Filters
Choosing a Filter

Backwash Valves  
Push-Pull Valves
Multiport Valves
Bottom Valves
Separation Tanks
Maintenance
Troubleshooting

Chemical Feeders  

Plumbing/Valves
Intakes
Valve Settings
Valve Actuators
Ortega Valves
Jandy Valves
Gate Valves
Ball Valves
Check Valves

Water Chemistry

Chlorine
pH Balance
Total Alkalinity
Calcium Hardness
Stabilizer
Salt Systems
Problems

Pool Maintenance
Preliminaries
Vacuuming
Leaf Bagging
Plaster Care
Chemical Care
Equipment Care
Seasonal Maintenance

About Us
What They Are Saying...
Contact Us
Privacy & Security













POOL School - exclusively from POOLplaza.com<img border=


Pool Supplies Home
   |  Pool Cleaners  |  Pool Heaters  |  Pool Pumps  |   Pool Filters  |  Pool Parts
 
  POOLplaza Inc. does not make any warranty or representation, either expressed or implied, regarding the accuracy or completeness of the information provided by this website; nor does POOLplaza Inc. assume any liability of any kind whatsoever related to, or resulting from, any use or reliance on this information.  The content of this website should not be used, if it is conflict with any applicable federal, state or local regulations or guidelines.
Copyright 2012 POOLplaza Swimming Pool Supplies - Dallas,TX. All rights reserved. Terms and Conditions