NT Labs Optimus Concentrated Dechlorinator & Conditioner 3 Sizes For Freshwater and Marine The word, "Optimus" in Latin translates to "the best". NT Labs Optimus is a concentrated aquarium water dechlorinator & conditioner, it detoxifies ammonia, nitrite, nitrate, & heavy metals. Optimus is a highly concentrated dechlorinator and conditioner that makes tap water safe for fish. Optimus removes chlorine, chloramine, halogens, and detoxifies heavy metals found in tap water. Optimus detoxifies ammonia, nitrite, and nitrate into a safe form that can be removed by the biofilter. Always test your aquarium water using NT Labs Test Kits. Optimus should be used when setting up a new aquarium and during every water change. Optimus should be used alongside Satus when starting up or ‘cycling’ a new aquarium to control ammonia and nitrite levels, thereby preventing ‘new tank syndrome’. Optimus is buffered and will not negatively affect pH or skimmers. Available in 3 sizes... 100ml - treats 4000L 250ml - treats 10000L 500ml - treats 20000L How to use: Shake bottle thoroughly before use. When adding to a new aquarium, calculate aquarium volume litres (length x width x depth (in cm)/1000). See label for full dose rate Dose for the full aquarium volume and add directly to the aquarium. During a water change, add the appropriate dose directly to the new water before adding to the aquarium. A half dose should be used when water temperature is +30°C and chlorine and ammonia levels are low. The normal dose can be doubled for water containing exceptionally high chloramine. Optimus can be used up to 5 times normal dosage to detoxify nitrite in an emergency. Sulphur odour is normal.