Not sure what that Question is asking...I use a slurry on my 1000 but i raise it with a natural finisher slurry stone (coti/slate) which is harder then the 1000 and contamination of the grit wont hurt here. But if your thinking of raising a slurry on a higher grit stone say the 6000 using your 1000 hone to raise it then the 6000 grit stone would be contaminated with 1000 grit particles.
When you use a stone of lower grit to raise a slurry then some of that slurry will be from your 1000, therefore when honing on say the 6000, your blade which you intend to impart a 6000 finish is encountering 1000 grit particles as well.
Glen is using a diamond grit hone to raise slurry, which works well because the diamond hone is so hard it don't loose any of it's particles and therefore no contamination of grit size.
I believe you can get a DMT credit card sized at a decent price. On some of my stones I use a piece of slate I found and smoothed for that purpose. Also look in classifieds there are often slurry stone available there.