The properties of porous Ti disc aerators for water treatment were investigated. It is shown that the addition of 5–15 wt-% of a finer (100–160 µm) sponge titanium powder to the coarser (630–1000 µm) base powder can increase the tensile strength of the discs obtained by a factor of two. This allows weight savings of 44% to be obtained at comparable strength levels for discs 188 mm in diameter. The discs produced from mixed powders also produce finer bubbles and have lower permeability, which can lead to energy savings through reduced pump power consumption.
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