API pH Down, Freshwater Aquarium Water pH Reducing Solution, 16 oz
API pH Down, Freshwater Aquarium Water pH Reducing Solution, 16 oz
Hero image 0 of API pH Down, Freshwater Aquarium Water pH Reducing Solution, 16 oz, 0 of 2

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
Price when purchased online
  • Free 90-day returns
Subscribe, Your usuals, on your schedule, Save time and stay stocked!, $15.98
One-time purchase $15.98

How do you want your item?

Try 30 days of Free Shipping with Walmart+! Choose plan at checkout.
How do you want your item?
Columbus, 43215
Arrives by Sat, Feb 14
.
Order within 7 hr 56 min
Fulfilled by Walmart
4.459218916046758 stars out of 5, based on 7539 seller reviews(4.5)
Report an issue with this seller
Free 90-day returns

More seller options (2)

Starting from $17.82
walmart plus

Get free delivery, shipping and more*

*Restrictions apply
Try Walmart+ now

Compare with similar items

Comparison Overview:
Product

Viewing this item

API pH Down, Freshwater Aquarium Water pH Reducing Solution, 16 oz
API pH Down, Freshwater Aquarium Water pH Reducing Solution, 16 oz
current price $15.98
API pH Down, Freshwater Aquarium Water pH Reducing Solution, 16 oz
4.7 out of 5 Stars. 9 reviews
API pH Down Aquarium pH Treatment 4 Ounces
API pH Down Aquarium pH Treatment 4 Ounces
current price $8.61
API pH Down Aquarium pH Treatment 4 Ounces
4.8 out of 5 Stars. 10 reviews
Tetra AquaSafe Plus Aquarium Water Conditioner and De-Chlorinator,16.9 oz
Tetra AquaSafe Plus Aquarium Water Conditioner and De-Chlorinator,16.9 oz
current price $17.27
Tetra AquaSafe Plus Aquarium Water Conditioner and De-Chlorinator,16.9 oz
4.6 out of 5 Stars. 175 reviews
API Stress Zyme, Freshwater And Saltwater Aquarium Cleaning Solution, 8 oz
API Stress Zyme, Freshwater And Saltwater Aquarium Cleaning Solution, 8 oz
current price $13.99
API Stress Zyme, Freshwater And Saltwater Aquarium Cleaning Solution, 8 oz
4.8 out of 5 Stars. 13 reviews
API pH Up Raises Aquarium pH for Freshwater Aquariums [Aquarium pH Treatments, Aquarium Supplies] 16 oz
API pH Up Raises Aquarium pH for Freshwater Aquariums [Aquarium pH Treatments, Aquarium Supplies] 16 oz
current price $21.69
API pH Up Raises Aquarium pH for Freshwater Aquariums [Aquarium pH Treatments, Aquarium Supplies] 16 oz
5 out of 5 Stars. 1 reviews
API Tap Water Conditioner, Aquarium Water Conditioner, 8 oz
API Tap Water Conditioner, Aquarium Water Conditioner, 8 oz
current price $13.86
API Tap Water Conditioner, Aquarium Water Conditioner, 8 oz
4.9 out of 5 Stars. 15 reviews
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
Now hiding additional rows in the Table

About this item

Product details

Specifications

Directions

Warranty

Customer ratings & reviews

4.7 out of 5 stars
stars9 ratings4 reviews
How item rating is calculated
Filtered and sorted results would be available on the new 'Customer ratings & reviews' page.
Sort by |

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
Sep 17, 2024
Jim
Item details
Size: 2.5 x 2.5 x 8.75
Sold byKwik RetailDelivered byWalmart
5 out of 5 stars review

Verified Purchase

My order came quickly with no hassles. Good job

Incentivized Review
Helpful?1SOTD2NSUUPF24870020