Pool alkalinity is a major part of pool water chemistry balance; hence if it is too low or too high, it must be adjusted immediately. the total alkalinity of a swimming pool or spa must be tested regularly on a daily basis. Failure to test your pool alkalinity levels can and will result in the water chemistry of your swimming pools and spas becoming unbalanced.
Unbalanced water chemistry leads to costly repairs of your spa or pool surfaces and equipment. When you are correcting your total alkalinity level, it is recommended that you do so in small calculated increments. The reason for this controlled process is due to the fact that, it is much easier for you to adjust your pool alkalinity (TA) Level slightly when it gets a little high or a little low.
You should not wait for your total alkalinity levels, to get way off and then try to bring it back under control all at once.
Since you are adjusting your pool alkalinity in increments, it is a good practice to re-test about every 24 hours after each adjustment.
This process will let you know if you have reached your desired alkalinity (TA) level or if you need to continue with your adjustments.
Swimming pool water chemistry requires the operator or technician to maintain a total alkalinity level that is set by industry standard. Ideally this level is between 80 to 120 ppm at all times. The pH level reading of a swimming pool or spa is govern by the total alkalinity level.
To raise your pool alkalinity level, you will have to add a swimming pool chemical called Sodium Bicarbonate which is another name for baking soda frankly.
Still, you must be aware that Sodium Bicarbonate will also cause an elevation in your pH levels as well. There are times when you may just want to raise your pH levels without affecting your total alkalinity. You can accomplish this by adding Soda Ash to your pool water.
Soda Ash is by no means the same as Baking Soda. In other words, it is not Sodium Bicarbonate. The table below gives a clear indication of what amount of Sodium Bicarbonate you will need to add to achieve a proper level of total alkalinity in your water.
The recommended dosage when using baking soda (100% Sodium Bicarbonate) to raise your pool alkalinity for a certain volume of pool water.
|Desired increase in PPM||1,000 gallons||5,000 gallons||10,000 gallons||20,000 gallons||50,000 gallons||100,000 gallons|
|40 ppm||8.97oz||2.80lbs||5.60lbs||11.2lbs||28lbs||56lbs||50 ppm||11.2 oz||3.50lbs||7lbs||14lbs||35lbs||70lbs|
|60 ppm||13.4 oz||4.20lbs||8.41lbs||16.8lbs||42lbs||84.1lbs|
Now you should never try to add more than 10 pounds of Sodium Bicarbonate at any given time. The correct procedure would be to add what you can get away with, re-test after about 24 hours and then if more is needed, then you add again. It is possible that you may need to test and treat your recreational water facilities, for metals in solution before you can add any Sodium Bicarbonate.
A good practice to get into, is to premix or dissolve the baking soda in a bucket or mixing drum and then add the solution to the swimming pool or spa. This procedure helps eliminate any signs of Sodium Bicarbonate from being visible at the bottom of your pool. Very unsightly to swimmers.
There will be cases where you will need to lower the total alkalinity level of your swimming pool. Question is...how can I lower the total alkalinity in my swimming pool? Well! This is usually accomplish using acids in liquid form as well in the form of acid salts. The most commonly used acids in the swimming pool and spa industry, are Muriatic Acid and Sodium Bisulfate.
If you are face with a situation where you just want to lower your pool alkalinity (TA) without seriously affecting your pH level, then you should pour the acid directly into the deep end of your pool as was already mentioned.
Research has shown that by you creating pockets of extremely low pH levels, you can burn off your alkaline materials and safely reduce your alkalinity levels.
Before you can do any adjustment to your total alkalinity levels, you have to know exactly how much acid you will need to add to get your desired ppm level.
The table below can be used as a guide. Still, you must add a small amount of Muriatic Acid at a time. This is usually 1 quart for every 10,000 gallons of water.
Below is a table with the recommended dosage for using Muriatic Acid (31.45%), to decrease your TA for a given volume of pool water.
|Desired increase in PPM||1000 gallons||5,000 gallons||10,000 gallons||20,000 gallons||50,000 gallons||100,000 gallons|
|10 ppm||2.56fl oz||12.8fl oz||1.60pts||1.60qts||3.99qts||2gals|
|20 ppm||5.11fl oz||1.60pts||1.60qts||3.20qts||2gals||4gals|
|30 ppm||7.67fl oz||1.20qts||2.40qts||1.20gals||3gal||6 gals|
|40 ppm||10.2fl oz||1.60qts||3.20qts||1.6gals||4gals||8gals|
|50 ppm||12.8fl oz||2qts||4qts||2gals||5gals||9.98-10gals|
Whenever, you attempt to lower or adjust your pool alkalinity using muriatic acid, you should remember to add it at the deep end of your pool in pint size shots. Afterwards, you should brush your swimming pool and spa bottom to ensure that the acid does not settle in one area.
The reason for this procedure, is due to the fact that acid is heavier than water and will cause etching of swimming pool surfaces.
When you have to deal with any type of pool or spa chemicals, you should always read the manufacturer's safety data sheets OR MSDS on the product you are using. The information that they provide, will make you aware of the potential dangers and safety guidelines of the product that you are dealing with.
Swimming pool care is not an easy job and most of the times, we are face with dangerous and difficult situations but if we know how to protect ourselves and others, then we are half way there.
Special Note: You should never mix two swimming pool or spa chemical together because the potential for creating a chemical bomb is enormous.
What you have to realize, not all manufacturers produce their chemicals in the same manner.
Because if they did, then we would have no need to worry about potential dangers.
So always follow the safety precautions and always wear protective gear (i.e. face masks, chemical gloves, goggles, and aprons) any pay close attention to any fumes that may occur as a result of adding chemicals to water.
Although there are many swimming pool chemicals on the market that are used in balancing the water chemistry of a pool or spa, your safety and that of others should always be first. So ALWAYS read the MSDS (Manufacturers Safey Data Sheets) before making any attempts to raise or lower the level of your spa and pool alkalinity.