16 ounce Refill size.... 10 PPM minimum, Always be prepared.....Colloidal research, manufactures Silver Hydrosol water using a unique and special process, that was developed, through extensive research, and development. This special process includes, using only 99.999 pure silver electrodes, with pure distilled water (no additives) while being precisely temperature controlled. The unique process is further enhanced through continual ozonation during a special - time specific - controlled process, with a predetermined, precise voltage and current. This specialized quality controlled process is how we are able to continually offer such a high quality Silver Hydrosol product, with high quality assurance standards. Simply spray under your tongue a few times a day.........Even skeptics who try this, can't help but notice an improvement in their overall well-being.