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Automatic strainers are normally more expensive than the manually cleaned units but their extra cost can often be justified for one or more of the following reasons:

• The frequency of cleaning of a manual unit and the cost of labor for doing this.
• If there is any danger that the strainer or the equipment that it is protecting may be damaged by the strainer not being cleaned when required.
• The strainer is necessarily located in a place where it is not readily accessible for cleaning.
• Plugging of the strainer is unpredictable due to a variable loading rate such that manual cleaning cannot be properly scheduled
• Insufficient available personnel for manual cleaning.

Automatic strainers are most commonly used on water service, the primary reason being the difficulty of disposing of the fluid which flushes the debris from the strainer. However, most automatic strainers can work on other fluids if the fluid can be disposed of satisfactorily. Many successful applications have been made with such fluids as black liquor, white water, starch, fuel oils (including Bunker C), lubricating oils, machine coolants, gasoline, and ammonia flushing liquor, caustic solutions and cooking oils.