I recommended this to a friend who is on a low potassium (K) diet. I figured if it worked for aquarium water it would work for boiled potato water which is high in potassium. After a single boil in a full pot of water, the K content in the boiled water was high. But after boiling it three times, the K content in the boiled water was significantly lower. (Doctors recommend decoctions to reduce potassium.) This test helps her determine if decoctions or other methods of soaking in water when choosing a diet will help reduce dietary potassium. However, I advised her not to stuff herself with boiled potatoes, just a small amount to satisfy her hunger.
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