A filtration system comprising a tank-like housing, accommodating a filtration assembly secured within the housing and extending between a respective raw fluid inlet port and a filtered fluid outlet port. The filtration assembly comprises one or more filter units secured over a main pipe disposed within the housing and configured between a fixed, operative position, and a manipulating position. The housing is configured with at least one re-sealable opening on a side wall thereof, through which the filter units are serviced at the manipulating position.