API Water pH Raising Solution raises the pH levels in freshwater aquariums. This solution is a highly effective tool in make aquarium water safe for fish and plants. Features: Raises freshwater aquarium water pH with a phosphate-free formula Does not promote algae growth with pH adjustments and is safe for plants and fish Slowly neutralizes acidic substances that cause low water pH Test water weekly and use to correct pH level in freshwater aquariums Includes: Contains one (1) API pH UP Freshwater Aquarium Water pH Raising Solution 4-Ounce Bottle Intended Pet(s): Fish Product Dimensions: 1.5 in x 1.5 in x 5.25 in Capacity: 4 fl oz Directions: Test the pH level of pond water with an API POND WIDE RANGE PH TEST KIT. Using the dosing cap on the bottle, add 10 ml (2 tsp.) of pH UP for each 50 U.S. gallons (190 L) of pond water. For best results, add to water flow. Tip: pH UP works by slowly neutralizing acidic substances that cause low pH in pond water. It'€™s important to test the pH when using pH UP. pH should be raised no more than .5 units every 24 hours. Do not treat the pond more than once every 24 hours. Plants and algae cause a temporary increase in pH in the afternoon; therefore, pH should be tested in the morning to obtain the lowest reading. Caution: Some fish may be sensitive to pH adjustments greater than 0.2 in a 24-hour period, so changes of this magnitude should be done with extreme care. API pH Up Adjuster Freshwater Aquarium Tank Water Conditioner, Size: 4 Fl oz | PetSmart