  We discuss recent evidence that currently accepted mass-loss rates may need
to be revised downwards, as a consequence of previously neglected ``clumping''
of the wind. New results on the radial stratification of the corresponding
clumping factors are summarized. We investigate the influence of clumping on
the ionization equilibrium of phosphorus, which is of major relevance when
deriving constraints on the clumping factors from an analysis of the FUV PV
resonance lines.
