Rejection of rate at EF for $J/\psi$, $\rm{D_s}$ and$\rm{B^0_d} \to \pi^+ \pi^-$ channels.

A detail study of the background rates after Event Filter for the three major B-physics channels was made. The measurements of the rates were made with modified offline code xKalman using the samples of background and signal events with pileup at low luminosity. The total semi-inclusive B-physics trigger rate after LVl2 and Event Filter is expected to be at the level of 0.82\% from the initial trigger rate at LVL2.