The problem did not go away when they reduced the water, it was hidden. The fact is the kidneys had been damaged already and flushing the body just highlighted the condition.
Most of us have damaged kidneys, and that is not just those with AF. Toxins, pesticides, insecticides, fertilizers etc, that we eat and drink and heavy metals will have damaged our kidneys.
Also they type of water is important. Tap water is filled with heavy metals, fluoride, inorganic minerals and these contribute to kidney problems. Pure H2O is the only water we should be drinking and 4 liters and over to ensure complete flushing of the body.