Theorem $g \circ ( \mathcal{A} \times^{\mathsf{RLD}} \mathcal{B}) \circ f = \langle ( \mathsf{FCD}) f^{- 1} \rangle \mathcal{A} \times^{\mathsf{RLD}} \langle ( \mathsf{FCD}) g \rangle \mathcal{B}$ for every reloids $f$, $g$ and filters $\mathcal{A} \in \mathfrak{F}^{\mathrm{Dst}\, f}$, $\mathcal{B} \in \mathfrak{F}^{\mathrm{Src}\, g}$.