Chlorine (and fluoride) block iodine receptors in the thyroid gland (dulce is a source of iodine as mentioned) which is why iodine is so important nowadays, because most people are saturated with a daily dose of chlorine. Do not drink or cook with chlorinated water, don't swim in it, don't bathe in it, don't breathe the fumes. Chlorine also kills beneficial bacteria and the enzymes in your juice.