Water Quality Testers

(83 results)
API® Freshwater Aquarium Master Test Kit
(293)
$35.99
$39.99
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API® E.M. Erythromycin Fish Bacterial Infection Treatment
(73)
$17.89
$26.49
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API® Stress Coat Tap Water Aquarium Conditioner
6 sizes
(357)
$2.29 - $37.58
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API® Aquarium Salt
3 sizes
(185)
$8.99 - $112.49
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API® Quick Start Aquarium Cycling Water Conditioner
3 sizes
(144)
$8.99 - $17.39
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API® Guide Fish Problem Solving General Cure
(60)
$16.39
$23.49
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API® Melafix Fish Bacterial Infection Treatment
(190)
$14.39
$16.99
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API® FIN & BODY CURE POWDER
(64)
$16.39
$17.99
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API® Turtle Sludge Destroyer 8 Oz
(20)
$8.69
$9.19
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API® Liquid Super Ick Cure
(155)
$6.99
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API® ACCU Clear Aquarium Water Clairifier
2 sizes
(297)
$5.59 - $9.49
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API® 5 in 1 Aquarium Test Strips
3 sizes
(143)
$6.99 - $24.98
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API® Saltwater Aquarium Master Test Kit
(8)
$35.98
$35.99
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API® Bottom Feeder Premium Shrimp Pellets Fish Food
2 sizes
(67)
$3.89 - $9.98
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API® Bettafix Freshwater Fish Bacterial Infection Treatment
(130)
$4.58
$4.99
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API® Leaf Zone Aquarium Plant Fertilizer
(62)
$8.19 - $13.49
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API® Amonia Test Kit
(10)
$15.49
$16.99
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API® Melafix Fish Bacterial Infection Treatment
(0)
$9.99
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API® Stress Zyme Aquarium Water Conditioner
3 sizes
(89)
$10.58 - $59.98
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API Algae Wafers
(10)
$3.49
$5.99
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API® Reef Aquarium Water Test Kit
(0)
$35.99
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API® Aqua Essential
2 sizes
(70)
$8.69 - $15.88
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API® Pond Algefix
2 sizes
(0)
$68.98 - $139.98
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+ 1 more
API® Turtle Water Conditioner
(8)
$8.69
$9.19
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API® Tropical Community Fish Flakes
2 sizes
(100)
$4.99 - $13.99
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API® Goldfish Premium Pellets Fish Food
(34)
$11.98
$11.99
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API® CO2 Booster Freshwater Aquarium Plant Supplement
(44)
$10.59 - $14.69
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API® Algaefix Aquarium Algae Control
3 sizes
(251)
$9.48 - $16.98
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API® pH Up Adjuster Freshwater Aquarium Water Conditioner
(22)
$7.09
$8.49
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API® Pimafix Fish Fungal Infection Treatment
2 sizes
(94)
$9.09 - $12.09
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API® Tap Water Conditioner Super Strength Aquarium Dechlorinator
3 sizes
(40)
$4.79 - $48.29
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API® Root Tabs Aquarium Plant Fertilizer- 10 count
(4)
$9.99
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API® Pimafix Fish Fungal Infection Treatment
(0)
$8.49
$9.99
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API® Pond Algaefix Algae Control 64 Oz
(0)
$41.99
$58.99
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+ 1 more
API Tropical Flake
(4)
$3.99
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API Chlorine & Heavy Metal Neutralizer Pond water Conditioner
(0)
$27.69
$33.99
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API Pond Aqua Essential
(0)
$16.99
$23.99
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API® Accu-Clear Clarifier Pond Water Conditioner
4 sizes
(2)
$13.49 - $65.98
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API Bottom Feeder Premium Squid Pellets
(6)
$5.99
$9.99
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API Stress Zyme Water Conditioner
(12)
$5.89
$6.49
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Help your finned friends get the most out of life by testing their water quality often. Ensuring that the water they’re swimming around in is in good condition is essential for their health and wellbeing. PetSmart’s collection of water test kits and water quality testers will help your fish live their best life. Give them water they can thrive in with one of our water quality test strips or kits. 
At PetSmart, you’ll find easy aquarium test strips and complete water testing kits for both freshwater and saltwater fish tanks. Invest in a water quality tester to check pH levels and ammonia, as well as chlorine and chloramine, nitrites, nitrates, water hardness, and more. 
In addition to water quality testers and water test kits, PetSmart has everything else you need to give your fish the absolute best care, including:
And for all you new fish parents who are just getting started with your aquariums, we even offer aquarium starter kits and a full selection of aquarium products that make it easy to start and maintain a new aquarium.
PetSmart also offers convenient shopping with curbside or in-store pickup. Need something today? We have select items available for same-day delivery in most areas powered by DoorDash. For items you purchase frequently, PetSmart has Autoship that automatically delivers the items you want to your door as often as you’d like. Check the website to see what items are eligible.