Check the listing for details. API POND pH Down pH adjuster 16 oz - 170B. Condition: New. Listed at 21.99 USD. API POND pH DOWN Pond Water pH Reducing Solution (16-Ounce Bottle, Model: 170B) is designed to lower the pH in pond water that tests at an undesirable level. Here are the key details about this product:Purpose: It helps safely correct pH problems in pond water, even when delicate fish and plants are present.Phosphate-Free Formula: The solution slowly neutralizes alkaline substances that cause high pond water pH.Safe for Pond Fish and Aquatic Plants: It contains no algae-promoting phosphates and is safe for your aquatic ecosystem.Easy to Use: Simply add 5 ml per 50 gallons of pond water using the dosing cap on the bottle.Colorless and Non-Clouding: It won’t cloud or color the water.Regulated for Transportation: Due to its composition, it is non-returnable, but if the item arrives damaged or defective, you may request a refund or replacement.Customer Ratings:Easy to use: 4.6 out of 5 starsValue for money: 2.9 out of 5 starsAccuracy: 2.6 out of 5 starsRemember to test your pond water weekly and use this solution to maintain the correct pH level for a healthy aquatic environment.