@schumacv The ingredients for thera tears is Sodium carboxy-methylcellulose and for Systane Complete PF is Propylene Glycol. I'm not a pharmacist but they don't look the same, but I could be wrong. What I was getting at was the delivery of the product, presenting the eye with medicine by way of a brand new sterile tip delivering the contents every few days, instead of one that encloses the product in a non-sterile environment at room temperature for weeks or months depending on how many times a day you rehydrate.