SAR-GEL Blue Water Finding Paste detects water contamination at the bottom of fuel storage tanks by changing color on contact with water. Operators use it to catch leaks, condensation, and phase separation before they cause microbial growth, tank corrosion, or engine damage. SAR-GEL paste is free of carcinogenic, mutagenic, and reprotoxic (CMR) substances and works across gasoline, diesel, jet fuel, and other petroleum products.
Water contamination in fuel tanks is a quiet threat. It doesn't announce itself with a warning light or an alarm. Instead, it settles at the bottom of a tank, often undetected, until it has already damaged the product, the equipment, or both. For terminal operators, marina owners, and fuel distributors, that kind of silent loss translates directly into wasted inventory and shrinking profit margins.
This is where water finding paste earns its place as a standard tool in tank inspection routines. Among the options available, SAR-GEL Blue Water Finding Paste from Arkema has become a trusted choice for operators who need fast, reliable results without exposing their teams to hazardous chemicals.
This post explains what water indicating paste does, why water contamination is such a persistent problem in fuel storage, and what makes SAR-GEL paste a dependable option for routine tank testing.
What is water indicating paste?
Water indicating paste—also called water finding paste—is a chemical tool used to detect the presence and depth of water at the bottom of fuel and chemical storage tanks. When applied to a gauging stick or bob and lowered into a tank, the paste changes color on contact with water, giving operators a clear, visual read on contamination levels.
This simple mechanism makes water finding paste one of the fastest ways to check tank conditions without pulling samples for lab analysis or relying solely on electronic sensors, which can fail or require calibration.
Why does water contamination happen in fuel storage tanks?
Water finds its way into fuel tanks through several common paths, including condensation inside the tank as temperatures shift, leaks in underground or marine tank seals, and phase separation in fuel blends like E10 gasoline, where ethanol absorbs ambient moisture over time.
Because these sources are often gradual rather than sudden, water contamination can build for weeks before it becomes visible through product quality issues or equipment complaints.
What problems does undetected water cause in fuel tanks?
Left unchecked, water at the bottom of a storage tank creates a cascade of expensive problems. Bacterial and microbial growth often develops at the fuel-water interface, producing sludge that clogs filters and fuel lines. Corrosion accelerates inside steel tanks exposed to standing water, shortening the tank's usable life. Engines and boilers that draw contaminated fuel can suffer misfires, reduced efficiency, or mechanical damage that requires costly repairs.
Choose regular water finding paste checks if your operation stores fuel for extended periods or operates in climates with significant temperature swings, since both conditions increase the risk of condensation-driven contamination.
How does SAR-GEL Blue Water Finding Paste work?
Arkema developed SAR-GEL water finding paste for quick and reliable detection of water in the bottom of tanks containing gasoline, E10 gasoline, diesel, jet fuel, fuel oil, biodiesel, light crude oil, solvents, and other materials incompatible with water.
The paste is applied to a gauging device, lowered to the bottom of the tank, and retrieved for a visual read. Where water is present, SAR-GEL paste changes color, giving operators an immediate and unambiguous result.
What makes SAR-GEL paste a safer choice for fuel testing?
SAR-GEL paste is free of carcinogenic, mutagenic, and reprotoxic (CMR) substances, which sets it apart from older water finding formulations that may rely on hazardous chemical compounds. For operators managing workplace safety compliance alongside routine tank maintenance, this distinction matters. Choose SAR-GEL paste if your facility prioritizes reducing CMR exposure risk for personnel who handle tank gauging equipment regularly.
Beyond its safety profile, SAR-GEL paste is straightforward to use. It doesn't require specialized training or complex equipment, which means tank gauging can remain part of a routine inspection schedule rather than an occasional, resource-heavy task.
Protect your fuel inventory before water contamination takes hold
Water contamination doesn't need a dramatic entry point to cause expensive problems. A slow leak, a season of condensation, or gradual phase separation in an ethanol blend can all lead to the same outcome: damaged product, corroded tanks, and strained equipment.
SAR-GEL Blue Water Finding Paste gives operators a fast, visual way to catch that contamination early, without introducing CMR substances into the workplace. Make tank gauging with SAR-GEL paste part of your regular inspection routine to protect your fuel inventory and the equipment that depends on it.
Frequently Asked Questions
What does SAR-GEL Blue Water Finding Paste detect?
SAR-GEL paste detects the presence and depth of water at the bottom of storage tanks containing gasoline, E10 gasoline, diesel, jet fuel, fuel oil, biodiesel, light crude oil, solvents, and other water-incompatible materials.
How does SAR-GEL paste indicate water contamination?
The paste changes color when it comes into contact with water, giving operators a clear visual signal when applied to a gauging stick or bob and lowered into the tank.
Is SAR-GEL paste safe to use around fuel storage personnel?
Yes. SAR-GEL paste is free of carcinogenic, mutagenic, and reprotoxic (CMR) substances, reducing chemical exposure risk compared to older water finding formulations.
How often should operators test for water contamination in fuel tanks?
Testing frequency depends on tank environment and risk factors. Tanks exposed to temperature swings, humidity, or known leak risks—such as marine terminals and underground storage tanks—benefit from more frequent gauging as part of a routine maintenance schedule.
What problems can undetected water cause in a fuel tank?
Undetected water can lead to bacterial and microbial growth, tank corrosion, and damage to engines or boilers that draw contaminated fuel.
