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We characterize effective descent morphisms of what we call filteredpreorders, and apply these results to slightly improve a known result, due tothe first author and F. Lucatelli Nunes, on the effective descent morphisms inlax comma categories of preorders. A filtered preorder, over a fixed preorder$X$, is defined as a preorder $A$ equipped with a profunctor $X\to A$ and,equivalently, as a set $A$ equipped with a family $(A_x)_{x\in X}$ of upclosedsubsets of $A$ with $x'\leqslant x\Rightarrow A_x\subseteq A_{x'}$.

Effective descent morphisms of filtered preorders