API pH Down, Freshwater Aquarium Water pH Reducing Solution, 16 oz
API pH Down, Freshwater Aquarium Water pH Reducing Solution, 16 oz
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API pH Down, Freshwater Aquarium Water pH Reducing Solution, 16 oz

4.7 stars out of 9 reviews
(4.7)|
9 ratings

Key item features

  • Contains one 1 API pH DOWN Freshwater Aquarium Water pH Reducing Solution 4-Ounce Bottle
  • Lowers freshwater aquarium water pH with a phosphate-free formula
  • Does not promote algae growth with pH adjustments and is safe for plants and fish
  • Slowly neutralizes alkaline substances that cause high water pH
  • Test water weekly and use to correct pH level in freshwater aquariums
  • This product contains 9.6% of sulfuric acid
Current price is $15.98
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Columbus, 43215
Arrives by Tue, Feb 10
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4.45765450383735 stars out of 5, based on 7435 seller reviews(4.5)
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Comparison Chart:
Aquarium water treatment typeAquarium Water TreatmentAPI pH Down, Freshwater Aquarium Water pH Reducing Solution, 16 ozAquarium Water TreatmentAPI pH Down Aquarium pH Treatment 4 OuncesAquarium Water ConditionerTetra AquaSafe Plus Aquarium Water Conditioner and De-Chlorinator,16.9 ozAquarium Water ConditionerAPI Stress Zyme, Freshwater And Saltwater Aquarium Cleaning Solution, 8 ozAquarium Water TreatmentAPI pH Up Raises Aquarium pH for Freshwater Aquariums [Aquarium pH Treatments, Aquarium Supplies] 16 ozAquarium Water ConditionerAPI Tap Water Conditioner, Aquarium Water Conditioner, 8 oz
Size16 ozAPI pH Down, Freshwater Aquarium Water pH Reducing Solution, 16 oz-API pH Down Aquarium pH Treatment 4 Ounces16.9 ozTetra AquaSafe Plus Aquarium Water Conditioner and De-Chlorinator,16.9 oz-API Stress Zyme, Freshwater And Saltwater Aquarium Cleaning Solution, 8 oz16 ozAPI pH Up Raises Aquarium pH for Freshwater Aquariums [Aquarium pH Treatments, Aquarium Supplies] 16 oz8 ozAPI Tap Water Conditioner, Aquarium Water Conditioner, 8 oz
Animal typeFishAPI pH Down, Freshwater Aquarium Water pH Reducing Solution, 16 ozFishAPI pH Down Aquarium pH Treatment 4 OuncesFishTetra AquaSafe Plus Aquarium Water Conditioner and De-Chlorinator,16.9 ozFishAPI Stress Zyme, Freshwater And Saltwater Aquarium Cleaning Solution, 8 ozAquariumAPI pH Up Raises Aquarium pH for Freshwater Aquariums [Aquarium pH Treatments, Aquarium Supplies] 16 ozFishAPI Tap Water Conditioner, Aquarium Water Conditioner, 8 oz
FeaturesEffectiveAPI pH Down, Freshwater Aquarium Water pH Reducing Solution, 16 oz-API pH Down Aquarium pH Treatment 4 OuncesConditionsTetra AquaSafe Plus Aquarium Water Conditioner and De-Chlorinator,16.9 oz-API Stress Zyme, Freshwater And Saltwater Aquarium Cleaning Solution, 8 oz-API pH Up Raises Aquarium pH for Freshwater Aquariums [Aquarium pH Treatments, Aquarium Supplies] 16 ozTap Water SafeAPI Tap Water Conditioner, Aquarium Water Conditioner, 8 oz
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Customer ratings & reviews

4.7 out of 5 stars
stars9 ratings4 reviews
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Showing 1-3 of 4 reviews

Oct 3, 2025
Adam
Top Reviewer
Item details
Size: 16 oz
Sold and shipped byKens Fish Inc.
5 out of 5 stars review

Verified Purchase

Great aquarium ph down and useful with plants.

I have always used API products with my fish so i know how gentle they are to use, and i found this to be also useful in preparing water for my vegetables and fruits i grow inside.

Incentivized Review
Helpful?1SOTD2NSUUPF24870020
Feb 19, 2025
Robert
Item details
Size: 2.5 x 2.5 x 8.75
Sold and shipped byLawn and Pets
5 out of 5 stars review

Verified Purchase

When water is highly alkaline, having a large quantity of ph down makes future purchases occur less. It's a necessity when aquarium water changes are required often.

Incentivized Review
Helpful?1SOTD2NSUUPF24870020
Dec 4, 2022
Kelly
5 out of 5 stars review

Verified Purchase

Fast delivery

Didn't know they made this for aquariums but I got a tester, the Ph up

Incentivized Review
Helpful?1SOTD2NSUUPF24870020