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https://www.swelluk.com:443/dr-tims-ammonium-chloride-solution/ 
Dr Tim's Ammonium Chloride Solution
Dr Tim's Ammonium Chloride Solution is used to add ammonia to your aquarium during fishless cycling, designed to be used with Dr Tim's One & Only.
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This bottle of Dr Tim's reagent grade ammonium chloride is for use when fishless cycling. Concentration is 50 mg/L of total ammonia-nitrogen (TAN).
Generally during a fishless cycle you need to add ammonium chloride to your tank 3 or 4 times.
Dosage: Dose 4 drops per gallon of aquarium water. Use with One and Only Nitrifying Bacteria.
- 1 teaspoon equals about 5 ml which is 100 drops.
- 1 tablespoon equals almost 15 ml which is 300 drops.