Modifications are described which are designed to eliminate oil problems in the Fermilab 1500 W refrigeration system for the magnet test facility which uses two oil-flooded C25L screw compressors in series. The functions of the compressors are listed. Nominal system specifications for combined refrigeration and liquefaction are given in table form, as is a description of the original oil removal system. Early operating experience and system improvements are presented. Present operating characteristics are described, along with a table of the Balston filter specifications. Subsequent recorded discussion concerned the sensitivity and reliability of the PPM laser detector.