API pH DOWN Liquid 118mL

pH DOWN Liquid lowers pH levels to make freshwater aquariums more acidic for fish and plants


  • Lowers aquarium pH
  • Phosphate free and nitrate free therefore will not encourage algae growth
  • Easy to use

Expiry Date: 03/2027

Follow API Easy Care Guide and use pH Down when:

  • Addressing Water Problem Solving issues

pH is the measure of acidic or alkaline conditions of water. A value of 7.0 corresponds to a neutral pH. pH values about 7.0 are considered alkaline, and pH values below 7.0 are considered acidic. Different fish need different pH levels to be healthy. Check the pH level using a pH Test Kit. pH DOWN is designed to lower the pH of aquarium water where testing has shown pH to be at an undesirable level. pH DOWN lowers pH and makes aquarium water more acidic. pH DOWN is fast-acting, colorless, easy to use and will not cloud or color the aquarium water. pH DOWN is phosphate-free and nitrate-free therefore will not encourage algae growth.


Determine the pH of aquarium water with an API pH Test Kit.

  • To lower pH, add ½ teaspoon (2.5 ml) for each 95L of aquarium water
  • For larger aquariums, add 1 teaspoon (5 ml) for each 180L of aquarium water
  • Take another pH reading before adding another dose of pH DOWN
  • 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


What's included:

  • 1 x API pH DOWN Liquid 118mL.
Brand API
Model # 30C
Barcode # 0317163030301
Shipping Weight 0.1700kg