ChlorGuardª safely, rapidly and efficiently removes toxic chlorine. Chlorine is commonly used in many municipal water sources to disinfect tap water. Chlorine is toxic to all aquatic life and should be removed before use of such water. ChlorGuardªshould be used whenever doing a water change or adding water. Be aware that many municipalities treat water with chloramines rather than chlorine. ChlorGuardª will not remove chloramines. Check with your municipality water provider if you are uncertain which is used in your area. If chloramines are used, then use Primeª instead.DIRECTIONS: BEGINNER: Use 2 drops for every 1Ð4 L (1 qt - 1 gallon*). ADVANCED: 1 drop added to 2ÊL (2 qt*) will remove 4 mg/L chlorine. Alternatively you may employ the following formula for a variety of chlorine and water levels: (CV)/8=d (for volume in liters) or (CV)/2=d (for volume in gallons*). C=chlorine concentration in mg/L, V=the volume of water being treated and d=the number of - UPC: 116041409