Home

Explore

View Cart

Deals

Saved

Suggested searches

Plant-based protein powders
Vegan leather handbags
Bedroom decor
Waterproof jackets
Hoodies

Learn more about how we use your data to personalize your experience and ads. Recommendations are for informational purposes only.

Pet Life

API pH Down - 16 fl oz

API pH Down - 16 fl oz

Pet Life

API pH Down - 16 fl oz

4.5 (1,234)

Sold 100+ last 30 days

20% off first order

$14.68$17.62

17% off

Color

Black

Quantity

Product description loading

Product description loading

This is the product description text that will appear here.

Shopping designed around you.

Start selling

For brands

For creators

Build your store

Information

Shop Pay

Help center

Social

X (Twitter)

Instagram

Legal

Terms of Service

Privacy Policy

Your Privacy Choices

Powered by

|

Start selling for free

Language

© Shopify Inc. 2026

Quantity

1

Description

Ph down - lowers ph and makes aquariums more acidic. Is fast-acting, colorless, easy-to-use, and will not cloud or color aquarium water. Long shelf life.

Delivery & Returns

Pet Life

Pet Life

Pet Life

4.3 (1.7K)

You might also like

API pH Up - 16 fl oz

17% off

Pet Life

API pH Up - 16 fl oz

API Stress Coat+ - 16 fl oz

17% off

Pet Life

API Stress Coat+ - 16 fl oz

Fritz Complete Water Conditioner 16 fl. oz

Pets Warehouse

Fritz Complete Water Conditioner 16 fl. oz

API pH Down Freshwater Aquarium Water Treatment 1.25 fl. oz

Pets Warehouse

API pH Down Freshwater Aquarium Water Treatment 1.25 fl. oz

api-pondcare-ph-down-16-oz

KensFish.com

API PondCare PH Down 16 oz

API pH Freshwater Aquarium Test Strip

Pets Warehouse

API pH Freshwater Aquarium Test Strip

Aqueon Goldfish Flakes - 1.02 Oz

17% off

Pet Life

Aqueon Goldfish Flakes - 1.02 Oz

Weco Nox-Ich Fish Parasite Treatment, 0.5-oz

HardyPaw

Weco Nox-Ich Fish Parasite Treatment

api-pond-master-test-kit

KensFish.com

API Pond Master Test Kit

KensFish.com

CaribSea Arag-Alive Special Grade Reef Sand

Nature Aquariums USA

API pH Test Kit Freshwater Aquarium 1ea

(1)

Aquarium Solutions IchX Saltwater Treatment 16 fl. oz

Pets Warehouse

Aquarium Solutions IchX Saltwater Treatment 16 fl. oz

API pH Test & Adjuster Kit - Bay Bridge Aquarium and Pet

Bay Bridge Aquarium

API pH Test & Adjuster Kit

API Proper PH 7.5 Freshwater Aquarium PH Stablizer Powder Solution - 9.2 Oz Default Title

17% off

Pet Life

API Proper PH 7.5 Freshwater Aquarium PH Stablizer Powder Solution - 9.2 Oz

Kordon NovAqua Plus - 1 gal

17% off

Pet Life

Kordon NovAqua Plus - 1 gal

API pH Test Kit - Freshwater - Bay Bridge Aquarium and Pet

Bay Bridge Aquarium

API pH Test Kit - Freshwater

Aqueon Tropical Flakes 2.29 Ounces

Pets Warehouse

Aqueon Tropical Flakes 2.29 Ounces

Tropical Showcase

API Proper pH 7.0

API pH Test Kit freshwater aquarium water testing kit with solution, test tube, and color chart to measure and monitor pH levels.

Tropical Treasures Wyo LLC

API pH Test Kit (Freshwater)

Seasonal pet refresh

Seasonal pet refresh

Shop brushes, deshedding tools, nail grinders

api-goldfish-aquarium-cleaner-4-oz

KensFish.com

API Goldfish Aquarium Cleaner 4 oz.

api-algae-scraper-acrylic-aquariums

KensFish.com

API Algae Scraper for Acrylic Aquariums

Seachem Reef Dip Coral Disinfectant 3.4 fl. oz

Pets Warehouse

Seachem Reef Dip Coral Disinfectant 3.4 fl. oz

Fritz Maracyn Freshwater & Saltwater Treatment - 10 pk

17% off

Pet Life

Fritz Maracyn Freshwater & Saltwater Treatment - 10 pk

aqueon-algae-remover-16-oz

KensFish.com

Aqueon Algae Remover

brightwell-aquatics-carbonit-p

KensFish.com

Brightwell Aquatics Carbonit-P

Kwik Pets

Kwik Pets

4.7

(290)

Buy ReefHD Antifungal Fish Medication 10 Capsules

Buy ReefHD Antifungal Fish Medication 10 Capsules

Front of Weco Products Wonder Shell Natural Minerals for Ponds White 2.25-oz Giant

API Algaefix Marine - 16 fl oz

17% off

Pet Life

API Algaefix Marine - 16 fl oz

hygger-8in1-aquarium-water-test-strips-50-count

KensFish.com

Hygger 8-in-1 Aquarium Water Test Strips 50 Count

red-sea-marine-care-multi-test-kit

KensFish.com

Red Sea Marine Care Multi Test Kit

(1)

6% off

Aquatix-2u

API Freshwater Aquarium Test Kit

TK Aquatics

API pH Test Kit FW

API Pond Chlorine & Heavy Metal Neutralizer - 16 fl oz

17% off

Pet Life

API Pond Chlorine & Heavy Metal Neutralizer - 16 fl oz

marineland-c530-foam-2-pack

KensFish.com

Marineland C-530 Replacemnt Foam 2 Pack

API Phosphate Test Kit - Freshwater/Saltwater

17% off

Pet Life

API Phosphate Test Kit - Freshwater/Saltwater

api-proper-ph-8-2-160-gram

KensFish.com

API Proper PH 8.2 210 Gram

Seachem Reef Kalkwasser - 500 g

17% off

Pet Life

Seachem Reef Kalkwasser - 500 g

aqueon-tap-water-conditioner-16-oz

KensFish.com

Aqueon Tap Water Conditioner

api=reef-master-test-kit

KensFish.com

API Reef Master Test Kit

API Low Range pH (Freshwater) Test Kit

J&L Aquatics Ltd.

API Low Range pH (Freshwater) Test Kit

API pH Down Freshwater Aquarium Water Treatment 16 fl. oz

Pets Warehouse

API pH Down Freshwater Aquarium Water Treatment 16 fl. oz

api-proper-ph-7-5-260-gram

KensFish.com

API Proper PH 7.5 260 Gram

(3)

Puppy travel zones

Puppy travel zones

Playpens, liners, carriers, and travel bowls.

Seachem Purigen - 500 ml

17% off

Pet Life

Seachem Purigen - 500 ml

Seachem Purigen - 250 ml

17% off

Pet Life

Seachem Purigen - 250 ml

zoo-med-hermit-crab-saltwater-conditioner

KensFish.com

Zoo Med Hermit Crab Salt Water Conditioner

API Proper pH 6.5 Aquarium Water Treatment 8.5 oz

Pets Warehouse

API Proper pH 6.5 Aquarium Water Treatment 8.5 oz

api-pondcare-pond-zyme-barley-8-oz

KensFish.com

API Pondcare Pond Zyme with Barley

(2)

API Accu-Clear - 1.25 fl oz

17% off

Pet Life

API Accu-Clear - 1.25 fl oz

Seachem Pristine - 500 ml

17% off

Pet Life

Seachem Pristine - 500 ml

API Professional Strength Melafix Baterial Infection Remedy 64 fl. oz

Pets Warehouse

API Professional Strength Melafix Baterial Infection Remedy 64 fl. oz

API Aquarium Salt - 16 oz

17% off

Pet Life

API Aquarium Salt - 16 oz

(1)

api-general-cure-10-pack

KensFish.com

API General Cure Powder

(3)

Hikari IchX Saltwater Treatment For Aquarium

HardyPaw

Hikari IchX Saltwater Treatment For Aquariums

Aquarium Depot

API pH Test Kit - Freshwater

api-melafix-marine-16-oz

KensFish.com

API Melafix Marine 16 oz.

API Proper pH 7.0 - 250 g

17% off

Pet Life

API Proper pH 7.0 - 250 g

Aqueon Tropical Flakes 1.02 Ounces

Pets Warehouse

Aqueon Tropical Flakes 1.02 Ounces

API pH Up Freshwater Aquarium Water Treatment 4 fl. oz

Pets Warehouse

API pH Up Freshwater Aquarium Water Treatment 4 fl. oz

api-goldfish-protect-4-oz

KensFish.com

API Goldfish Protect 4 oz.

Keep your cat entertained

Keep your cat entertained

Felt toys, treat puzzles, and wobblers.

API pH Down - 4 fl oz

17% off

Pet Life

API pH Down - 4 fl oz

API Betta Complete Water Conditioner - 1.25 fl oz

17% off

Pet Life

API Betta Complete Water Conditioner - 1.25 fl oz

API Aqua Essential - 8 oz

17% off

Pet Life

API Aqua Essential - 8 oz

API pH Down Freshwater Aquarium Water Treatment 4 fl. oz

Pets Warehouse

API pH Down Freshwater Aquarium Water Treatment 4 fl. oz

api-sludge-destroyer-8-oz

KensFish.com

API Turtle Sludge Destroyer

api-turtle-water-conditioner-4-oz

KensFish.com

API Turtle Water Conditioner

API pH Aquarium Test Strips - 25 pk

17% off

Pet Life

API pH Aquarium Test Strips - 25 pk

NorthFin Krill Pro - 6 mm Sinking Pellets - 500 g

17% off

Pet Life

NorthFin Krill Pro - 6 mm Sinking Pellets - 500 g

API Water Conditioner 8 oz bottle aquarium water treatment that neutralizes chlorine, chloramine, and heavy metals

Tropical Treasures Wyo LLC

API Water Conditioner 8 oz

cascade-600-internal-bio-sponge

KensFish.com

Cascade 600 Internal Bio Sponge

BM Tone-Up Gold for Loose Stools in Dogs - 4 oz - Dog Health Care & Wellness 1

HardyPaw

BM Tone-Up Gold for Loose Stools in Dogs

Tropical Showcase

API Test Kit pH

Blue Fish Aquarium

API pH Test Kit

API Stress Coat Marine - 16 fl oz

17% off

Pet Life

API Stress Coat Marine - 16 fl oz