Yes, This person is absolutely correct. Salt water flushes can be risky. There was an instance in which someone I treated had a bad reaction to the salt water flush. They became very sick -- their kidneys ached and had ringing in the ears. They were bedridden for a few days. The kidneys have to filter sodium from the blood and too much sodium for some people can be dangerous. People with one kidney or kidney disease, on dialysis or have high blood pressure or heart problems should not do a salt water flush. Too much salt can cause electrolyte imbalances and cause edema and high blood pressure. I have personally done the Ayurveda salt water flush many times successfully. However, there is the risk that someone may not react well to it. Salt water flushing is a very valuable tool but the body can be very unpredictable. I would use Iridology to look at someones eyes to see if they have a 'Hessian' or delicate constitution in the inner part of their iris near the pupil. Someone reported that they used half the amount of required salt with good results. That is, One teaspoon instead of two per liter. Less may be better. The mini Lagoo Ayurveda cleanse uses 3 litres of saltwater and has a reputation for being safe. The Master Cleanser
only uses 1 litre. Using any more than 3 litres should be done under supervision if at all.