second set including a plurality of degassing modules wherein the first and second sets are connected in parallel each degassing module 141 incorporates membrane filters the membrane filters include hollow fibers the hollow fiber are preferably polymeric strands typically fabricated from poly 4methylpentene 1 which are permeable to dissolved gases but impermeable to liquids during operation the layup water is pumped through one or more of degassing modules 141 a vacuum from a vacuum pump assembly 144 is applied to each of the degassing modules 141 such that any dissolved gases in the layup water are drawn through the hollow fibers and withdrawn from the degassing modules 141 the vacuum pump assembly 144 preferably includes a liquid ring type vacuum pump the present invention however is not limited to a liquid ring type vacuum pump other types of vacuum pumps may be used the level of vacuum required for degassing water from saturation 7 to 8 ppm oxygen to 50 to 200 ppb oxygen is easily achieved with a commercial liquid ring vacuum pump each degassing module 141 is individually connected to the vacuum pump assembly 144 which discharges to atmosphere the vacuum level is monitored by a vacuum gauge or sensor 234 as shown in fig2 a single vacuum gauge may be employed with the degassing skid assembly 140 the present invention however is not limited to the use of a single vacuum gauge rather each degassing module 141 may be equipped with a vacuum gauge maintenance of the dissolved oxygen concentration at low levels is achievable as the hollow fibers in the filters greatly increases the available surface area.