A water filtration apparatus (1, Fig. 1) includes a tank 2 having a contaminated water inlet pipe 3 and a purified water outlet pipe 4, wherein the tank is separated into first 6, second 7 and third (9, Fig. 1) chambers. The first and second chambers are separated by a hollow filter wall 5 having diagonally opposite openings at respective ends permitting contaminated water to flow from the first chamber into the opening 18 and along the inside of the filter wall to its other end to thereafter flow out of the other opening 19 into the second chamber. A coalescent filter 13 between the second chamber and the third chamber supplies purified water to the purified water outlet pipe. Suitably, the coalescent filter is an open-meshed filter mounted on a perforated tube 11 having an exit end in direct fluid communication with the third chamber. In one embodiment, the apparatus includes a floatable skimmer 20 within the first chamber to suck oil or light liquid from the surface of the water via a suction pump.
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