Bombara has a branch that specialists in water softening filters. The filter branch may be in the sponsor list. They are very good I bought some test strips and they really do soften the water. I have very little scale after 18 months using the filters. They are designed to fit in line to a filtered water out let but could probably be linked to a tap. They are around $50 and last for 12 months.
I am also in Perth.