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Canonical topology on Schthecategoryofschemes?

Every category admits a Grothendieck topology, called canonical, which is the finest topology which makes representable functor into sheaves.

Is there a concrete description of the canonical topology on $Sch$? the category of schemes? By Grothendieck's results on descent this is at least as fine as the fpqc topology, but I don't even know if the two actually coincide. If not, what is known about it?

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Canonical topology on Sch

Every category admits a Grothendieck topology, called canonical, which is the finest topology which makes representable functor into sheaves.

Is there a concrete description of the canonical topology on $Sch$? By Grothendieck's results on descent this is at least as fine as the fpqc topology, but I don't even know if the two actually coincide. If not, what is known about it?