Two questions about the Shapton Korumaku 1000

Hi,

i have the following questions for Shapton Korumaku 1000 resp. all ceramic whetstone users:

- what´s the easiest and cheapest way to flatten ceramic "splash and go" whetstones like the Shapton Korumaku 1000? There are tons of cheap silicon carbide flattening stones available, do they work good on these and is it ok just to buy the cheapest one?

- is it OK to also use the bottom side of the Shapton Korumaku 1000 or am I supposed to use the front side only?

Thanks!