If TA is low you first add sodium bicarbonate (baking soda), circulate,test again. Once desired TA level is attained adjust pH.
If the pool is too acidic, pH is low, add soda ash (sodium carbonate). If it is too alkaline, pH is high, add muriatic acid.
You can still get in the pool. The chemicals work best when the pH is balanced so add PH PLUS. If the PH is really low it is very acidic and could burn the eyes a bit
Potash
You would be safest using Baquacil pH Increaser, which is a high purity, highly active dry alkaline product used to raise pool pH. In non-Baquacil pool water, both Soda Ash and Hydrochloric acid are used to raise pH levels. Pool shops are a good place to seek advice also.
If you are getting a low reading of chlorine in your above ground pool, you should add the appropriate amount of chlorine to get it back to the correct level. This is important to keep your pool running at maximum abilities.
make sure chlorine is is at 1-3ppm, if pH is very low raise chlorine slightly higer than average. shock the pool after and run filter for over night. If pool still not stabilize then add PH high chemical.
Add chlorine and stabilizer.
Alkaline is considered to have a ph of 7.0 .. becoming more alkaline is 7 or <.
go to the local market that you get chlorine at and pool shock. buy test strips that test the water's chlorine, and just add an extra chlorine tablet each time you add chlorine. if its still really low and not even close to the amount you may want to add pool shock
Add more in smaller amounts and test again.
You can raise the alkaline level if your pool water by adding sodium bicarbonate (aka baking soda). It is recommended that you raise the alkaline in small increments because it is easier to raise your total alkaline levels slightly if its a little too high or too low. This chart from swimming-pool-care.com gives out how much sodium bicarbonate to add.Desired increase in PPM1,000 gallons5,000 gallons10,000 gallons20,000 gallons50,000 gallons100,000 gallons10 ppm2.24oz11.2oz1.40lbs2.80lbs7.00lbs14.00lbs20 ppm4.48oz1.402.80lbs5.60lbs14.0lbs28lbs30 ppm6.72oz2.10lbs4.20lbs8.41lbs21lbs42lbs40 ppm8.97oz2.80lbs5.60lbs11.2lbs28lbs56lbs50 ppm11.2 oz3.50lbs7lbs14lbs35lbs70lbs60 ppm13.4 oz4.20lbs8.41lbs16.8lbs42lbs84.1lbs
yes.. it has a low pH ... acid rain... so you need to add pH plus.