My Japanese is a bit rusty; What does the instruction in the back say to sprinkle something?

I rub the flattening stone against the sharpening stone using running water.

Can you use the flat side to sharpen/flattening single bevel knives? would be useful to have this as a dual function stone

I wouldn’t use this stone to sharpen. The flat side can be used for major repairs and possibly for thinning but will negatively impact the life of the flattening stone more so than if you just used it for flattening.

How does this flattening stone compare to the Norton flattening stone?

Being that I haven't used the Norton flattening stone I can't give an honest opinion. The Naniwa stone has worked fine for me for leveling my stones.

will this fix a king 1000 and king 6000 watering stones

Unfortunately my stone arrived broke.

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Description

⚡ Sharpen your edge, flatten your game!

COMPACT PORTABLE - Slim 5.6 x 17.6 cm design fits effortlessly in any tool kit
OPTIMAL GRIT DENSITY - 220 grit particulate ensures efficient and smooth stone resurfacing
LIGHTWEIGHT DURABILITY - At just 408 grams, it’s easy to maneuver without sacrificing strength
VERSATILE SHARPENING AID - Ideal for maintaining and repairing all your whetstones with professional-grade results
PRECISION FLATTENING POWER - Quickly corrects troughs for a perfectly flat sharpening surface

The Naniwa #220 IO-1142 Japanese whetstone flattening stone is a precision tool designed to quickly and effectively restore flatness to sharpening stones. With a particulate density of 220 grit, it ensures a smooth, professional finish. Its compact size and lightweight design make it an essential, portable accessory for any sharpening enthusiast or professional.

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