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Some of the contaminants most frequently found in refrigeration systems are moisture, copper oxide, dirt, flux, and flaked or powdered aluminium. While the filter-drier will usually trap these materials, this is not always the case. Moisture and water in a system can lead to further contamination due to formation of rust, corrosion, refrigerate decomposition, oil

The flood-back of oil can be equally as damaging as the flood-back of liquid refrigerant in terms of liquid slugging only. A well designed piping system will promote a uniform movement of oil, preventing the accumulation of damaging oil slugs. System piping is particularly critical, for instance with Systems that must Operate for extended periods