Pure ammonium chloride for fishless cycling. Add 4 drops per gallon for an ammonia concentration of 2 ppm. Treats 400 gallons.

• Use Instructions: Dose 4 drops per gallon of aquarium water.* Use with One and Only Nitrifying Bacteria.Generally during a fishless cycle you need to add ammonium chloride to your tank 3 times so: a 8 ounce (480 ml) bottle will cycle 400 gallons (1,514 liters)Some conversions:1 drop equals 0.05 ml1 ml equals 20 drops1 teaspoon equals about 5 ml which is 100 drops1 tablespoon equals almost 15 ml which is 300 drops*NOTE: As of November 1, 2016 we changed the concentration of the ammonium chloride solution so it now takes 4 drops per gallon. The previous version called for 1 drop per gallon. Please see the label on your bottle to determine how much to use. If the bottle says use 1 drop use 1 drop if the bottle says use 4 drops use 4 drops.