Potatoes are very high in potassium but you can remove part of the potassium by using one of these methods:
Double cook method:
Peel and dice or cut potatoes. Place in a large pot of water and bring to a boil. Drain the water and add fresh water to the pot. Bring to a boil, cook for 10 minutes then drain and set aside.
Peel and dice potatoes. Place in a large pot of warm tap water and soak for 2 to 4 hours. Drain and set aside.
When kidneys fail they can no longer remove excess potassium, so the level builds up in the body. High potassium in the blood is called hyperkalemia, which may occur in people with advanced stages of chronic kidney disease. People with functioning kidneys need around 4,700 mg of potassium in their daily diet. However, people with chronic kidney disease (CKD) should consume much less — around 1,500 to 2,700 mg each day.
Average of 420mg Potassium in 100g potato.