API pH Up Freshwater Aquarium Water Treatment
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Help safely and quickly raise the pH in your freshwater aquarium for more alkaline water conditions with API pH Up Aquarium Water Treatment. Different fish need different pH levels to stay healthy. For example, most freshwater fish thrive in levels between 6.5 and 7.5, but Cichlids and crustaceans require higher pH levels between 7.8 and 8.8. Levels that are too high or too low can cause stress, illness and death, so testing is crucial to the health of your fish. API pH Up Aquarium Water Treatment is designed to raise pH in water that tests at an undesirable level. It is fast-acting, colorless and easy to use. It will not cloud or color aquarium water and because it's phosphate- and nitrate-free, it will not encourage algae growth.
Key Benefits- Safely raises pH in freshwater aquariums to desirable levels.
- Fast-acting, concentrated, colorless and easy to use.
- Phosphate- and nitrate-free, so it should not encourage algae growth.
- Formulated to not cloud or cause water discoloration.
- Helps keep your freshwater aquarium water in tip-top condition for your finned friends.
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 extremen care.
Help keep your saltwater aquarium in tip-top shape with API's Marine Master Test Kit or Saltwater Master Test Kit.
Test your freshwater or saltwater aquarium's water with API's 5 in 1 Test Strips.
Measure your freshwater aquarium's pH level with API's Freshwater Master Test Kit.
Test your aquarium's pH level with API's pH Test Kit, pH Test and Adjuster Kit or pH Test Strips.
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Item Number94421
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Aquarium TypeFreshwater
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Fish TypeTropical Freshwater, Betta, Goldfish, Bottom Feeder, Cichlid
- Determine the pH of aquarium water with an API pH Test Kit.
- To raise pH, add ½ teaspoon (2.5 ml) for each 25 U.S. gallons of aquarium water.
- For larger aquariums, add 1 teaspoon (5 ml) for each 50 U.S. gallons of aquarium water.
- Take another pH reading before adding another dose of pH Up.
- 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 does API PH UP do?
API PH UP is added to water to raise pH levels, making water more alkaline.
Can I use repeated doses of API PH up?
Yes, you can use API PH UP once daily in your aquarium, but you should always check the pH between doses.
Can API PH UP be used in marine aquariums?
API PH UP will not cause any harm to marine aquariums, but it is designed specifically for fine-tuning pH, and is not strong enough to have an effect on marine aquarium levels.
Can API PH UP be used with live plants?
Yes, API PH UP and API PH DOWN are safe for live plants.
Does API PH UP also increase KH?
No, it does not.
Customer Reviews

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6 Reviews
6 Reviews
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test your ph first
By annab3ll3 on Feb 16, 2021
I spent so much money trying to figure out why green slime kept growing and fish were dying and all I needed to do was to test my tank and balance the PH no more algee and fish are happy
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ph up bottles
By bobo on Jul 11, 2020
got ph up bottles deliverd to my house they were leaking in box need new ones
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Great product
By Tamm on Jan 26, 2019
Fast shipper good product my fish love this stuff and so do i. Keep up the good work chewy.com
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More good product for the money
By Ferdie4 on Aug 13, 2018
I usually get a small bottle of this for the same price. This will last much longer and helps keep the PH up in my tank. Even with frequent water changes & cleanings the PH needs help.
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Good Stuff
By Catfish143 on Dec 14, 2017
This stuff really works. Be careful, read and follow directions. Don’t over do it. Raise the pH slowly for your finishes benefit. But API’s “pH UP”” will do it.
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Works good.
By allthingswildlover on Sep 6, 2017
Ph up works really well for my cichlid tank. Chewy has the best price that I've found and the customer service is great!