A portable fluid filtration system. The portable filtration system includes a trailer having a ceiling with a predetermined height, and having an openable and closeable ceiling passage. One or more filter assembles are disposed in the trailer. Each filter assembly includes a filter base and a filter cartridge connectible and dis-connectible to the filter base. The filter cartridge has a height such that when it is disposed on the filter base, the filter cartridge extends beyond the predetermined height of the trailer ceiling. The system also has a fluid input/output assembly disposed in the trailer and fluidically connected to the at least one filter assembly, the liquid input/output assembly being for receiving fluid to be cleaned and inputting it to the at least one filter assembly and for receiving filtered fluid from the filter assembly and for outputting it. The system further has a rotatable, extendable filter cartridge mover disposed in the trailer, for connecting and disconnecting the filter cartridge to the filter base.