Your pool water turned green immediately after adding pH Plus because the chemical had increased the pH level to high. You may need to adjust the alkalinity levels of the water using another pool chemical such as pH Minus of pH Alkalinity Plus.
Test the water, then adjust your Ph to about 7.2. Then chlorinate.
Adjust alkalinity first
Add Muriatic acid to the water. CAREFULLY
Muriatic Acid lowers the pH level in a pool.
Well because rain is polluted water and the chlorine in the pool has a different pH level than the polluted water. Therefore, when it rains, the polluted water and the chlorine water combine and make a whole different solution or different pH level.
The water will irritate your skin.
The salt itself in a salt water pool can cause itching
pH range for swimming pools is normally between 7.2 and 7.6
pH measures the level of acidity or basicity in the water. Should be 7.2-7.8
You can check the water Ph level in a pool by using specially designed test strips. You can purchase these strips at most major retail chains such as Walmart, Target, or Sears.