I have always had a goal of drinking half (ounces) of my body weight (number in pounds).
Example: a 150 pound person = drinks 75 ounces.
The 4 Liters is approx 136 ounces so, you'd need to weigh in at about 272 pounds to absorb this.
According to mayo clinic online Although uncommon, it is possible to drink too much water. When your kidneys are unable to excrete the excess water, the electrolyte (mineral) content of the blood is diluted, resulting in low sodium levels in the blood, a condition called hyponatremia.
So if you are taking salt tablets to compensate -I'd say STOP. Please...take better care of yourself than this.
Why are you doing this?