  The effect of isoscalar S-wave processes
$\pi\pi\to\pi\pi,K\overline{K},\eta\eta$ is considered in the analysis of data
(from the ARGUS, CLEO, CUSB, Crystal Ball, Belle, BABAR collaborations) on the
bottomonia decays --- $\Upsilon(mS)\to\Upsilon(nS)\pi\pi$ ($m>n, m=2,3,4,5,
n=1,2,3$). It is shown that the dipion mass spectra of these decays are
explained by the unified mechanism related to the contribution of the
multichannel $\pi\pi$ scattering in the final states of these reactions. Since
in the analysis the multichannel $\pi\pi$-scattering amplitudes did not change
in comparison with the ones in our combined analysis of data on the
multichannel $\pi\pi$ scattering and on the charmonia decays ---
$J/\psi\to\phi(\pi\pi, K\overline{K})$ and $\psi(2S)\to J/\psi(\pi\pi)$ (from
the Crystal Ball, DM2, Mark II, Mark III, and BES II) --- the results confirm
all our earlier conclusions on the scalar mesons.
