LTM 1.75lb Renew Non-Chlorine Shock Tabs A non-chlorine shock treatment conveniently packaged in easy-to-use tablets that quickly dissolve in spa water and break down residual soaps, deodorants, natural oils and organic materials before they have a chance to form combined chlorine. Fast-dissolving effervescent tablets Dissolves quickly to eliminate oils and residue Does not affect pH level No chlorine-like odors Chlorine-Free Allows for use minutes after application Formulated with DuPont™ Oxone® Easy to use-- no measuring!