I know, I'm bringing this one back from the dead.... but I'm confused. Why is this becoming so complicated? Water, sugar, drying, refrigerating....
Heat a cast iron griddle with oil.
Grate potato directly onto griddle.
Leave it alone.
When the bottom is nice and brown, flip it.
When both sides are brown, serve.
You can do the same thing with Russets, reds, Yukons, and even sweet potatos. The cook times are different, and I season them differently (try sweet potatos with a little onion grated in, some cheese on top with a side of duck eggs...) , but the technique is the same. You just need to play with your temperatures and make sure the cast iron is seasoned correctly. You don't have to cook them very hot, and they won't be done in microwave time, but it is worth it.
After my family got addicted to hash browns, "forcing" me to make them 2 or three times a week, I have lost any desire to ever again experience a dehydrated, frozen, tasteless white pile of shredded potato remains.
Remember the KISS method. Restaurants use the boxed and frozen stuff to be able to get it onto a customer's plate quickly without using too much grill space or labor time. It is about the bottom line. The good stuff is fresh, and the fresher the better. There isn't much in the world like eating hash browns made with a potato that was unearthed that morning, accompanied by homegrown garlic chives and a couple of eggs that were laid the night before.