Getting the perfect balance of alkalinity and pH is always tricky because the acid will affect both but at varying rate. But you can do it if you follow this guide.
What You’ll Need
Here are the things you will need:
- Perfect pool test kit – I would recommend you to get a digital water test kit. That kit will give you the most accurate reading to work with.
- Aeration – Aeration is not a chemical or tool but a process that you will use to raise the pH while maintaining the TA.
- Muriatic acid – The acid helps to lower both the TA and pH. You can use sodium bisulfate also, but this acid is more effective.
- Protective gears – Also, wear things such as gloves, goggles, long sleeves cloths, and other protective gears.
Ideal pH and TA Levels
Even before you know how to raise alkalinity without raising pH in hot tub, you need to have an idea of the pH and TA levels you should target.
- The ideal TA level should be 100 ppm (80-120 ppm is balanced).
- You should target a pH level of 7.4-7.6.
Step by Step Guide
Here are the steps that you should follow when raising the pH while maintaining the TA constant.
- Take Accurate Readings of TA and pH
Use the digital test kit to take the reading of the pH and TA. Assume you get a TA of 280 ppm and a pH of 8.3. Your reading can be higher or even lower.
- Set the Target Value of TA
Let assume you want to achieve a TA level of 100 ppm. You should note that both the pH and TA reduce when you add acid.
A target of 80-90 ppm should also be excellent, but that might mean the pH dropping to way past 7.0 when you add the acid.
Use online pool calculators to determine the amount of muriatic acid you should add to get your desired results – in our case is 100 ppm. Don’t worry about the pH here since you will raise it later.
- Dilute Muriatic Acid/ Add it to Your Hot Tub or Pool
Assume our pool can hold 20K gallons of water. To achieve a TA of 100ppm, we need to add about two-quart of muriatic acid. You should distribute the acid evenly around your pool while the pool pump is operating.
Read More: Best pool pump
Note that natural aeration will start as soon as you add the acid and the pH level will begin to rise. You can leave this to occur until the pH gets to the desired level, but it will take longer.
- Test Pool’s TA and pH after Six Hours
You can keep an eye on the changes in TA and pH by doing some test after every six hours. If the pH and the TA are within the desired range, then you are done.
You might get some readings like 205 ppm for TA and 7.6 for pH when you do your first test after six hours.
- Test Pool’s TA and pH after 24 Hours
The TA should have dropped to about 120 ppm after 24-hour while the pH might still be lower, around 7.1.
- Test Pool’s TA and pH after 48 Hours
After two days, the TA should have dropped to around 100ppm, which is within the recommended range of 80-120 ppm. By now the pH should be stable at approximately 7.4, which is within 7.4-7.6. The pH cannot rise above that since the TA has stabilized.
Note: You can accelerate the aeration by using an air compressor with a tube (with a few holes). Place the tube inside the water, and it will raise the pH within a few hours without raising the TA.
If you don’t intend to use your pool soon, follow the natural aeration. That’s how you raise the pH without raising the TA.