API Proper pH 7.5 Aquarium Water Treatment, slide 1 of 1

API Proper pH 7.5 Aquarium Water Treatment, 9.2-oz bottle

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Automatically set and stabilize pH with API's Proper pH 7.5 Aquarium Water Treatment. Different fish need different pH levels to stay healthy. For example, goldfish, mollies, guppies and barbs thrive at 7.5. Levels that are too high, or too low can cause stress, illness and can even lead to fish loss. This API water treatment is formulated to help modify and maintain pH for several weeks while neutralizing harmful chlorine and toxic heavy metals. It also contains soothing aloe vera and electrolytes to help heal damaged tissue and help prevent electrolyte imbalance. Best of all, it's easy to use and fast dissolving, making it ideal to use during aquarium setup or water changes.

Key Benefits
  • Formulated to help set and stabilize pH at 7.5 for fish who thrive off of this level like goldfish, mollies, guppies and barbs.
  • Helps to remove chlorine and detoxify heavy metals, for a more habitable environment for your finned friends.
  • Easy to use, fast dissolving and is ideal to use during setup and water changes.
  • Specifically designed to help modify and maintain pH levels in freshwater aquariums.
  • Contains aloe vera to help heal and regenerate damaged tissue, plus electrolytes to help prevent electrolyte imbalance.

Avoid all personal contact, including inhalation. Wear protective clothing when risk of exposure occurs. Use in well-ventilated area. Prevent concentration in hollows and sumps. DO NOT enter confined spaces until atmosphere has been checked. DO NOT allow material to contact humans, exposed food or food utensils. Avoid contact with incompatible materials. When handling, DO NOT eat, drink or smoke.
Not for use in aquarium containing live plants.

Test your aquarium's pH level with API's pH Test Kit, pH Test and Adjuster Kit or pH Test Strips.

See all items by API

  • Item Number
  • Aquarium Type
  • Fish Type
    Goldfish, Tropical Freshwater
  • Store in original container.
  • Keep containers securely sealed.
  • Store in a cool, dry, well-ventilated area.
  • Store away from incompatible materials and foodstuff containers.
  • Protect containers against physical damage and check regularly for leaks.
  • Observe manufacturer's storage and handling recommendations.


API PROPER PH is a PH buffer that automatically raises or lowers pH and stabilizes it at the pre-set level. Because it is a true buffer, API PROPER PH will automatically adjust and hold the pH at 6.5, 7.0, 7.5, and 8.2. API PROPER PH 6.5, 7.0, and 7.5 powders also neutralize chlorine, detoxify heavy metals, and add electrolytes to the aquarium. API PROPER PH 8.2 is a carbonate/bicarbonate buffer formulated for use in saltwater aquariums and with African Cichlids.

How does API PROPER PH adjust pH?

API PROPER PH formulas are more than pH adjusters, they are pH buffers. pH buffers are formulated to “lock in” the pH at a predetermined pH level. pH buffers compensate for fluctuations in pH, automatically adjusting the pH to the predetermined level. API PROPER PH 7.0, for example, will lower or raise the pH until 7.0 is reached. pH will not “rebound” to the original level.

How many doses of API PROPER PH will it take to adjust my pH?

Normally, one dose will set the pH. Some tap water sources used in freshwater aquariums are strongly buffered at pH 8.0 and above. In this case, two doses of API PROPER PH may be required to overcome the buffer system and reset the pH to a desirable level. Although all artificial seawater mixes use a bicarbonate/carbonate buffer, the final pH of artificial seawater is often below or well above pH 8.2. Proper pH 8.2 will work with the existing buffer to bring the pH to 8.2 – 8.4. Normally 1 dose of API PROPER PH 8.2 is all that is required to adjust and stabilize the pH in saltwater.

How long will API PROPER PH last in the aquarium?

In most aquariums, Proper pH lasts several weeks. As Proper pH works to maintain a stable pH, it gets “used up.” Natural acids formed by the decomposition of fish waste also neutralize API PROPER PH. Aquariums with large fish or heavily stocked aquariums may require more frequent use of API PROPER PH. When you see the pH begin to shift out of the desired range, add another dose of API PROPER pH. Adding tap water or making water changes can cause pH to shift. Proper pH can be added whenever a water change is completed.

How does hard water affect API PROPER PH?

Hard water, high in calcium and magnesium, may cause cloudy water with API PROPER PH, 6.5, 7.0, and 7.5. These formulas will combine with water hardness minerals, rendering them insoluble. This water softening effect can cause a temporary hazy to form. In very hard water, API PROPER PH will make a thick, white cloud in the water. To avoid hazy water, we recommend reducing water hardness to 100 ppm or less. Use the API WATER SOFTENER PILLOW to reduce water hardness.

Is API PROPER PH a phosphate buffer?

API PROPER PH 8.2 is a bicarbonate and carbonate buffer, and contains no phosphate. API PROPER PH 6.5, 7.0, and 7.5 are phosphate buffers. Phosphate buffers are the most reliable buffers for freshwater aquariums. They are non-toxic to fish and easily “lock in” the pH for extended periods of time.

Do phosphate buffers stimulate algal growth?

No. Phosphate buffers combine with essential trace elements, like iron, causing nutrient deficiencies. API PROPER PH 6.5, 7.0, and 7.5 should not be used in aquariums where algal growth is desirable.

Will API PROPER PH increase carbonate hardness?

Carbonate hardness, also known as “alkalinity” and “KH,” is the level of bicarbonate and carbonate ions in water. The KH level is also a measurement of water’s ability to resist pH change. API PROPER PH 8.2 contains bicarbonate and carbonate buffers, and will directly increase carbonate hardness. API PROPER PH 6.5, 7.0, and 7.5 contain no carbonate hardness, but will cause an increase in carbonate hardness as measured with KH test kits. KH test kits work by acidifying the water in the test tube, drop by drop, with a test reagent. When the water sample is adequately acidified, a color change occurs in the test tube. This is called “the end point.” The number of drops of test reagent required to acidify the sample (causing a color change) indicates the level of KH. Phosphate buffers strongly resist pH change and will be measured just like bicarbonate and carbonate buffers. Therefore, API PROPER PH (6.5, 7.0, and 7.5) will cause an increase in KH measurements.

Will phosphate buffers affect carbon dioxide test kits?

Yes. Carbon dioxide test kits work much like carbonate hardness test kits. A water sample heavily buffered with phosphate buffers will resist the pH change required to reach the end point color change. This in turn causes a “false high” carbon dioxide level test result. You will not be able to accurately measure carbon dioxide levels when phosphate buffers are added to aquarium water.

Rating: 4.8 of 5 stars 5 Reviews 5 Reviews 4.8 out of 5 Stars

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Rating: 4.8 of 5 stars 4.8 / 5

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  • 5 out of 5 stars

    Great Product!

    By Zackster86 on Aug 9, 2021

    I have a tank with oscars, blood parrots, a synodontis catfish and a Redfin shark who are picky when it comes to the PH of their home and are prone to not feel good with the slightest change. This helps so much…it gets my water babies feeling back to normal fast!

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  • 5 out of 5 stars

    Good product

    By Lizz on Oct 22, 2021

    Keeps the levels in the fish tank good. Love API products, its all I use.

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  • 5 out of 5 stars

    I love it and Highly Recommend

    By Kadenexpe1 on Sep 14, 2020

    I’ve seen a difference in my black mollies and it really increase my ph levels from a 6.0 to a 7.5. My fish love Chewy .

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  • 5 out of 5 stars

    Great product

    By Tamm on Jan 27, 2019

    I love this product. It does the job&i can see a difference in my fish. They to love cheey.com

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  • 4 out of 5 stars

    Good Product!

    By mrnat2 on Sep 13, 2018

    This is the only Treatment we have found that has worked. We have had problems with the PH since we moved here, we have tried a number of products none have worked. We are happy with the results, the goldfish like it also. thank you!

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