I don't want to run them both in series, that is the thing. Nor do I want to run them both at the same time in parallel, I simply want to have the option of kicking over to the DE to polish the water. I suppose that I could just pick one or the other and ditch the other, but I simply want to filter with sand, and like before a party, use the DE to get that super clear water...

What do you think?