Add potash. See your pool shop with a sample of your water and the size of your pool and he will give you what your pool requires.
You can lower pool pH by adding muriatic acid. Monitoring pH levels in a pool is important for health and water clarity.
By adding an alkaline like potash or bicarb.
muriatic acid
By adding a base.
Add acid
Muriatic Acid....Be real careful though.
Hydrochloric acid is most commonly known as muriatic acid and is used to lower pH in pools
Add acid, Muriatic acid works best but Dry Acid is also used.
That Acid is called Muriatic Acid. You put it in your swimming pool to lower the PH of the water. At lower PH Levels, the chlorine you use to sanitize the pool is more active, as a disinfectant. You MUST be careful not to put too MUCH Muriatic Acid in your pool! PH that is too low will create potentially deadly fumes, so test your water. Low pH is corrosive to plaster and metal pool parst.
You lower the Ph by using Muriatic acid VERY carefully. This acid and it's vapour is dangerous. With the pool pump ON, carefully add 1/4 gallon at a time, waiting 6 hours then testing.
use either muriatic acid or dry acid (sodium bisulfate)
You could add it back to the pool, if you need to lower the pH - but why put all the gunk the cell has taken from the water, back into the water? Better to discard the cell cleaning acid and use fresh acid to lower pH.
Sodium bisulfate (AKA sodium hydrogen sulfate or sodium acid sulfate) is an acid that will lower pH. If you lower the pH of a swimming pool buffered with baking soda (sodium bicarbonate) and maybe cyanuric acid (stabilizer), your alkalinity will go down, along with the pH. But usually, what people want is to lower the alkalinity (or TA) without lowering the pH. When you lower the pH on a carbonate buffered pool, you convert some of the carbonates into carbonic acid, where they no longer contribute to the measured alkalinity. But, as soon as you raise your pH, the carbonic acid switches back to carbonate, and your TA goes right back up with the pH. To actually LOWER the alkalinity, you have to lower the pH, and then REMOVE some of the carbonic acid, which you can do be aerating the pool, since carbonic acid is a form of carbon dioxide gas.
The only way to lower your cya level in your swimming pool is to partially drain your pool and fill with fresh water that will lower it or if you want to lower it to almost nothing completely drain your pool and start over but keep in mind chlorine tablets will raise your CYA level More information in the related link below.
It depends on the pH level in the pool and the gallons of the pools, also how many ppm you want to lower it.
In order to not cause irritation of the eyes and skin, the pH of the pool water should be between 7.2 - 7.6. Muriatic acid is added to the pool to lower the pH if it is too high.