API Pond pH UpAPI Pond pH Up pH adjuster slowly raises the pH of pond water, making it more alkaline, without harming delicate pond fish or aquatic plants. It slowly neutralizes acid substances that contribute to low pH, which can stress pond fish and suppress the activity of your ponds natural biological filter. Test the pH level of the pond water with an API POND WIDE RANGE pH TEST KIT. Use the dosing cap on the bottle. Add 10 ml. of POND pH UP pH adjuster for