API Proper pH 7.0 Aquarium Water Treatment, 8.8-oz bottle

Rated 3.75 out of 5 stars
$10.98Chewy Price
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This Item – API Proper pH 7.0 Aquarium Water Treatment, 8.8-oz bottle
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About This Item


  • Formulated to help set and stabilize pH at 7.0 for fish who thrive off of this level.
  • Helps to remove chlorine and detoxify heavy metals, for a more habitable environment for your finned friends.
  • Specifically designed to help modify and maintain pH levels in freshwater aquariums.
  • Easy to use, fast dissolving and is ideal to use during setup and water changes.
  • Contains aloe vera to help heal and regenerate damaged tissue, plus electrolytes to help prevent electrolyte imbalance.

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

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

About API Water Conditioners

It’s Smart To Be Proactive!

The best way to keep your aquarium clean is to maintain good water quality. This will help keep your fish strong and vibrant and prevent disease. Water conditioners and test kits from API can help you keep your aquarium water safe and healthy.

How Do I Maintain a Healthy Environment?

It is important to test your aquarium water weekly to ensure it stays healthy for your fish.  In addition, a bi-weekly partial water change of no more than 25% will help reduce toxic buildup, remove debris the filter missed, and replenish the oxygen available to your fish.

Feed Twice Daily and Test Water Weekly

Feed your fish twice a day, check their water temperature, and observe them to make sure they are active. You should also test water quality weekly for optimal safety. For fish to thrive, their water must closely match that of their natural environment—poor water quality can cause stress, illness and even fish loss. The 6 important parameters for healthy aquarium water are ammonia, nitrite, nitrate, pH and water hardness (GH & KH). All of these can vary over time and are invisible to the eye.

Change Water and Restore the Ecosystem

In a closed aquarium environment, there are no natural rivers or streams to carry away debris and other waste materials. That is why you should replace 25% of your aquarium water every two weeks, making sure to add water conditioner to your tap water to make it safe for your fish. You should also change your filter media and clean your gravel monthly. Adding beneficial nitrifying bacteria with API Quick Start when you do will help restore your aquarium’s fragile ecosystem and avoid disruption.

What Do API Products Do and When Do I Use Them?

API Test Kits

Use test kits weekly to monitor water quality parameters, which can vary over time and impact the health of your fish.

API Stress Zyme

Using this every week will help keep your aquarium clean and your gravel and ornaments sludge-free.

API Algaefix

Use weekly to control algae growth and keep aquarium glass, ornaments and plants clean.

API Stress Coat

Use every 2 weeks during water changes to make tap water safe, and when adding fish, or when fish are injured.

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 TypeTropical FreshwaterGoldfish, Tropical FreshwaterCichlid, Tropical FreshwaterCichlid, Marine Fish, Marine Invertebrate, Tropical FreshwaterBetta, Bottom Feeder, Cichlid, Goldfish, Tropical Freshwater
Aquarium TypeFreshwaterFreshwaterFreshwaterSaltwater, FreshwaterFreshwater

Questions & Answers

13 Customer Questions

I have a betta in my tank already and my pH is .5 off and would like to add this agent. Is it safe to add when my fish is already in the tank? Or is it recommended to take the fish out? If so, how long does it need to be in the tank before I put him back in? I also have a snail.
Answer by ChewyJan 22, 2018
You use this product with or without fish inside the tank. Use when setting up a new aquarium, adjusting pH in an established aquarium or changing water.

Is this safe for aquatic turtles?
Answer by ChewyApr 08, 2019
This product is safe for use with aquatic turtles.

Is this safe for a community fish tank with fish that range between a normal 6.5 to 8 pH
Answer by ChewyJan 09, 2019
This product is formulated to help set and stabilize pH at 7.0 for fish who thrive off of this level.

I’m a boo is but does this test water hardness
Answer by ChewyFeb 04, 2021
API PROPER PH products are pH buffers. They set the pH of aquarium water at a particular level, and also function as a dechlorinator. This means no additional dechlorinator is needed when using these products to treat water.

ReviewsWrite a Review

Rated 3.75 out of 5 stars
20 Ratings
Would recommend to a friend

20 Customer Reviews

Rated 5 out of 5 stars
By LittleWolfImp on Mar 15, 2023

Great and easy way to help balance your fish tank

My husband uses it in his 55g topical community fish tank. Not sure what is wrong with the water at our house but he can keep it below 7.8. This product works well and helps to keep the tank around 7.2 with live plants in the tank. I really recommend it to any one with PH issues and live plants in the tank.

Rated 5 out of 5 stars
By Yofrendonna on May 21, 2023

Essential for my aquarium

Necessary to maintain aquarium water quality and health of my fish

Rated 5 out of 5 stars
By melpepsi on Aug 30, 2022

Good product

My PH is back to normal thanks to this! It was high but it finally came down thanks to API.

Rated 5 out of 5 stars
By Ragsanchance on May 23, 2022

Good Stuff!

This has kept Spot healthy for 13 years. Being a large Goldfish, Spot needs regular water changes and his water is always just right!

Rated 3 out of 5 stars
By 404notfound on Apr 25, 2021

Works at a cost

The water out of my tap is 8.2pH. I've kept an aquarium for 20 years and recently moved, so having to adjust the pH is new for me. This has vague instructions. Experience says to disolve separately in a bucket of water and add to the aquarium slowly. It worked, bringing my 29 gal aquarium down to 7.0 to 7.2 which most of my fish thrive at. However, the water is no longer crystal clear. At first I thought it was conflicting with the gimmick tablet in the Tetra Whisper filter cartridges that supposedly helps with pH and keeping the aquarium clean of algae growth, but that's not the case. I think I will be looking elsewhere for solutions to reducing the alkalinity of my tap water... (Currently fighting a black beard algea infestation that destroyed most of the plant decor I had...)

Rated 1 out of 5 stars
By Daniel on Apr 23, 2021

Murky gray haze. No pH changes.

I used this pH adjuster in my 10g tank a few times, and it did not increase the pH at all. Even worse, today, the tank was crystal clear all day until I put this in to try and fix the acidic water, and within an hour, it had a horrible gray haze that even a 2/3 water change and clarifiers has not fixed. Had this same odd issue for over two months with regular, significant water changes before it finally cleared up. Now that I realized what was doing it, I will be throwing this out ASAP. Definitely avoid this!

Rated 4 out of 5 stars
By 404notfound on Apr 17, 2021

It works but is vague with how to.

Wish there were more instructions on this. The water out of my tap is 8.2 pH. I also use freshwater aquarium salt. The instructions on this are very vague and past experience cautioned that I dissolve the powder compound in a separate bucket before slowly adding it to the aquarium so as to not shock the fish. 29 gal water + 4 teaspoons compound dissolved in 2 quarts of water and added after 20 minutes dropped the pH to 7.2 which is in acceptable range for my fish. There was some slight cloudiness but it cleared up within an hour.

Rated 1 out of 5 stars
By Rich on Apr 13, 2021


It may work fine in non-planted aquariums, but apparently it contains a phosphate buffer which will harm live plants. Hence my 1 star review. I also learned that it is best not to "chase" an idea pH. Better to explore natural products, e.g. peat pellets, that gradually change and hold the pH. I did not see the planted aquarium warning in the description when I ordered it. I am going to attempt a return with Customer Service.

Rated 1 out of 5 stars
By dezibo77 on Feb 27, 2021

Doesn't work

I have used this in my 30g hospital tank multiple times to increase my pH. Never increased my pH once. Tank is still at 6.6. very disappointing product.

Rated 5 out of 5 stars
By carla on Jan 10, 2021

Instant Solution

did exactly what I needed done, no fuss, no muss i didn't have to empty the tank, didn't hurt the fish - just perfect!