These are not designed to clean dirty fuel. They only filter/polish it. They use fine filtration to remove tiny particles and water molecules before they grow large enough to be a problem. A Filtration/polishing unit that cleans heavily contaminated fuel needs regular filter changes.

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Fuel polishing systems are vital for diesel-powered emergency systems. They remove a critical point of failure: fuel contamination. Modern engines and fuel systems need clean fuel to run reliably. If left untreated diesel is under constant attack from water, microbial growth and solid particulates, even after cleaning.

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The solution is  Diesel Defence units preserve your stored fuel to EN590 standards, greatly improving the reliability and dependability of your critical systems such as standby generators.