A 1993 case study in the journal “Nephron” showed that water intoxication can exaggerate the body’s response to peptide hormones that flush sodium and water out of the body. The flushing of fluids leads to potassium deficiency, otherwise known as hypokalemia.
Magnesium Depletion
Drinking too much water can also lead to depletion of magnesium in your body — a mineral essential to maintaining potassium levels. Magnesium can be flushed out of your body through your urine the same way as potassium. Without adequate magnesium in your body, potassium has difficulty entering into your cells where potassium storage takes place. When the potassium cannot enter your cells for storage, your kidneys will eventually process it and flush it out through your urine.
I would have a difficult time believeing I have no salts in my pee, when I pee from drinking extra water.