API pH Freshwater Aquarium Test & Adjuster Kit, 250 count

Rated 3.625 out of 5 stars
$12.33 (-33%)Chewy Price
$18.28Chewy Price
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About This Item


  • Complete kit monitors and adjusts aquarium pH and creates healthy freshwater conditions.
  • The kit tests the pH of freshwater within a 6.0 to 7.6 range and adjusts the levels as needed.
  • Includes three 1.25 ounce bottles of pH Up, pH Down and pH Indicator solutions and pH results color card.
  • Follow the recommendations and use either the pH Up or pH Down solution to adjust levels.
  • Provides 250 tests per box.

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Play Video: Learn More About API From Our Team of Experts
Learn More About API From Our Team of Experts

Help set and stablize your aquarium's pH level with API's Proper pH 6.5, Proper pH 7.0, Proper pH 7.5, or Proper pH 8.5 water treatement.
Help lower your aquarium's pH level with API's pH Down or raise it with API's pH Up water treatment.

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About API Testing

Testing the Waters

For fish to thrive, their aquarium water must be similar to the water in their natural environment. Poor water quality can cause stress, illness and even the loss of your fish. Important water quality parameters include ammonia, nitrite, nitrate, and pH. These can vary over time, and they are invisible to the eye, which is why it is necessary to test weekly. Choose from a wide range of API testing options like the Freshwater Master Test Kit or 5-in-1 Test Strips to accurately evaluate your water.

Pressed for Time? Just Dip and Read

Simply dip an API test strip into your aquarium, swirl it twice, and then use the color-coded chart to determine if your water is within safe parameters or if adjustments are needed. That’s it! API test strips are available in a 5-in-1 version, which includes testing for pH, nitrite, nitrate, carbonate, and general hardness. Ammonia and pH test strips are also available so you can mix and match according to your needs.

The Scientific Approach

Get professional results from the comfort of your home with API test kits. Measure up to six parameters with API Master Test Kits, or pick and choose from a wide variety of individual test kits. Both types of kits come with test tubes and a laminated, calibrated color card. API test kits allow for numerous tests, making them an inexpensive way to help keep your aquarium water quality in check.

How to Correct Aquarium Water Parameters

Too Much Ammonia?

Ammonia is released into the water through gills, urine, uneaten food and more. API Ammo-Lock detoxifies it instantly.

Inappropriate pH Levels?

Fish require a specific pH level to thrive. Use API pH Down to lower freshwater aquarium water pH to the right level.

Too Much Nitrite?

Use API Quick Start to quickly consume nitrite and help maintain an active biological filter.

Nitrates Too High?

API Nitra-Zorb helps remove nitrate and other toxins that can be harmful to fish and lead to algae growth.

About API

The team at API has a passion for fish and understands the rewards and relaxation fishkeeping can bring. For almost 60 years, they have developed premium products with a focus on proven and effective results. API offers a range of testing kits, water conditioners and nutritionally superior fish foods. They are dedicated to making a better underwater world for the benefit of fish and those who keep them.

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Fish TypeBetta, Bottom Feeder, Cichlid, Goldfish, Tropical FreshwaterBetta, Bottom Feeder, Cichlid, Goldfish, Tropical FreshwaterBetta, Bottom Feeder, Cichlid...Betta, Bottom Feeder, Cichlid...Betta, Bottom Feeder, Cichlid...
Aquarium TypeFreshwaterFreshwaterSaltwater, FreshwaterSaltwater, FreshwaterSaltwater, Freshwater

Questions & Answers

2 Customer Questions

Is API ph up and API ph down safe for use with betta fish?
Answer by ChewyJun 12, 2021
This product is safe for betta fish.

How many tests can be done from one kit?
Answer by ChewySep 08, 2020
This kit provides 250 tests per box.

ReviewsWrite a Review

Rated 3.625 out of 5 stars
8 Ratings
Would recommend to a friend

8 Customer Reviews

Rated 2 out of 5 stars