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What Are Water Test Strips and Why Do Commercial Kitchens Need Them?

Water test strips are single-use, paper- or plastic-based reactive kits containing chemical reagents that change color when exposed to specific substances in water. In a restaurant, bar, cafe, or commercial kitchen, water quality and sanitizer testing are not optional but an operational and regulatory requirement. Water test strip packs typically contain 50 to 100 strips per vial or roll, from which you can tear a small strip and use it for testing.

Commercial dishwashers, sinks, ice machines, coffee and espresso equipment, combi ovens, and steamers depend on water that meets basic requirements for operational safety. Chlorine concentration, pH balance, sanitizer density, and water hardness directly affect sanitization effectiveness, equipment longevity, beverage quality, and compliance with health department inspections. Water test strips deliver instant, on-site results without laboratory equipment, facilitating the process for foodservice operators.

Types of Water Test Strips for Foodservice Operations

Water test strips are available for chlorine, sanitizer, pH level, and water hardness.

Chlorine and Sanitizer Test Strips

Chlorine test strips measure free available chlorine (FAC) and total chlorine concentrations in sanitizing solutions. Food codes require chlorine sanitizer concentrations in three-compartment sinks and dishwashers to fall between 50 ppm and 200 ppm (parts per million) according to West Virginia University. Chlorine test strips typically cover ranges of 0–200 ppm or 0–500 ppm, with color pads reading in increments of 10, 25, or 50 ppm, depending on the product.

Iodine test strips are used to test iodophor-based sanitizers, with typical measurement ranges of 0–25 ppm. Quaternary ammonium (quat) sanitizer test strips measure quat concentrations, typically in the range of 0–400 ppm or 0–1000 ppm, and are used for no-rinse sanitizing solutions and surface sanitizers.

pH Water Test Strips

pH test strips measure the acidity or alkalinity of water and solutions on a scale of 0–14. pH test strips provide a quick and practical testing solution for foodservice establishments since pH directly affects sanitizer effectiveness.

Water Hardness Test Strips

Hard water, which refers to high levels of calcium and magnesium, causes scale buildup in commercial dishwashers, steamers, coffee brewers, and ice machines. Water hardness test strips measure total hardness in grains per gallon (GPG) or milligrams per liter (mg/L), with common ranges of 0–425 mg/L or 0–25 GPG.