Analysis by Secondary Ion Mass Spectrometry (SIMS) of the melt inclusions found in plagioclase, pyroxene and olivine host minerals of clasts from the 5,600 years BP Taal Caldera scoria pyroclastic flow (SPF) deposits reveals up to 3.9 wt% of pre-eruptive H2O in the melts. The water content is comparable to that of in-melt inclusions from other mafic-intermediate explosive eruptions and probably contributed to the volume and explosive nature of the SPF eruptions.