Not sure I want to bother saying conjuration should not have SR:No spells again (see the other thread), but I will point out one thing:

So let me get this straight: Orb of Acid conjures normal non-magical acid so you have SR:No. But(!?!) you can dispell the normal non-magical acid once someone is immersed in it? If it is 'normal' acid dispel magic should have no effect. And for that matter anti-magic has no effect on mundane things like acid or fire....so why does it effect the spells.

Your going for the idea that:1. It takes a tiny drop of magic to conjure the real mundane stuff but 2. everything after that is 100% mundane and non magical.

Also if the Orb of X is just a 'normal orb of X' then you can't counterspell these spells right?