Polyphosphatase (polyPase) involved in the degradation of inorganic polyphosphates (polyP) that is able to degrade a range of chains from three to several hundreds of residues in a highly processive manner. [phosphate](n) + H2O = [phosphate](n-1) + H(+) + phosphate Present with 3170 molecules/cell in log phase SD medium. Belongs to the PPase class C family.