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The porosity using norm NTC 4321-3 in samples with kaolin mixtures of the region of Pamplona (N. de S.) was deter-mined in function of the fire temperature. The temperatures varied of 600°C to 800°C whereas the time of fire oscillates between 15 and 60 minutes. The mixtures were composed of kaolin - pumice stone and kaolin - diatomaceous earth, where the majority phase (kaolin) varying from 90% to 55%, whereas the second phase (pumice stone, diatomite) was the difference. The apparent density was determined using the method of immersion in mercury and the relative density using norm NTC 237. The behaviour was analyzed to be used in the manufacture of filter water devices in domestic applications. [ABSTRACT FROM AUTHOR]