The reasons for fuel tank cleaning can be in response to either a contamination issue, or simply to be pro-active in ensuring that your fuel stocks remain in good condition. This particular case came from a tank cleaning client who first approached us around two years ago to perform fuel tank cleaning on some underground tanks that were redundant. On this occasion, the diesel tank is situated on one of their 30+ forecourts and is crucial to the continued running of the garage. The tank has had been suffering from a sludge contamination issue, with dispensing filters blocking on a regular basis, causing disruption to the operation. We were informed that water tests had been carried out on the tank and that water was not found, however this had been conducted from the dispensing pumps and not in the tank itself. In addition to the water tests, additives had been introduced into the tank to try and alleviate the problem. Whilst additives can certainly help to reduce the level of contaminants found in fuel stocks, there comes a point where fuel tank cleaning simply cannot be beaten to ensure the operation runs smoothly.