Two filters on HALCW resin circuit have been replaced. O-ring 235# were changed on both filter cartridge houses.  25micron  10"x 2.5" 3M cartridge new filters  are used. Old filters are not very dirty. They are bagged and stored in vacuum pit. Residual water from cartridge houses are collected and stored in high active storage jug with sealed cap.  No leak on resin circuit before and after the job.