You buy 2 x 100ml (100ml sodium chlorite 25%,and 100ml Hydrochloric solution 5%) in blue Pharmancy glass bottle with childs lock,and each bottle has pipette. Water Purification Set, 100ml Hydrochloric solution 5% & 100ml Sodium ChIorite NaClO2 25%. Condition is New.. Chlorine Dioxide Water Purification. water purification and water disinfectionin Pharmacy Glass bottles. bottles have “pipette,and childs lock” built in at top 1 x 25% Sodium Chlorite – 100 ml 1 x Hydrochloric solution 5% – 100 ml Mix Components 1:1 25% Sodium Chlorite + Hydrochloric solution 5% you buy; Component A (left bottle on main picture): Sodium Chlorite solution 25% (100 ml) Component B (right bottle on the main picture): Activator, Hydrochloric solution 5%(100 ml)thanks. Ingredients 1: Sodium Chlorite 25% Directions: Mix 1:1 equal drops of acid activator.( Hydrochloric solution 5%) Ingredients 2: Hydrochloric solution 5% [Activator] Mix in glass, plastic, ceramic or other non-metal holder. Wait until the mixture turns amber and Chlorine Dioxide [ClO2] is produced, then add to water. Mix drops as needed. Do not use entire bottle at once. ClO2 is recognised by WHO as an effective biocide for the treatment of bacteria, viruses, fungi, protozoa and parasites in water. 25% NaClO2 Precursor and Activator Must Be Mixed Before Use. Use biocide responsibly. Keep out of the reach of children. Always replace cap after use. Store out direct sunlight. Water Purifying Drops Use to Treat Water For Camping Hiking Outdoor Sports Activities Water sourced outdoors can be made safe to drink with chlorine dioxide water purifying drops. made in UK. Dispatched with 24h,delivery time by the post office rate. 2 class sign for. Royalmail.com Many Thanks.