Aquarium Doctor Filter Control

How it works Encourages beneficial bacteria: Introduces nitrifying bacteria to establish biological filtration faster, breaking down harmful ammonia and nitrites. Discourages bad bacteria: Helps suppress heterotrophic bacteria that can cause problems. Speeds up maturation: Can mature filters in days, though some systems take longer (up to 3 weeks). How to use For new aquariums: Add 1ml per 4.5 litres (1 gallon) of water once to kickstart the filter. For maintenance: Add 1ml per 45 litres (about 10 gallons) monthly. Check water quality: Monitor ammonia and nitrite levels; add fish only when levels are zero.   Key benefits Safe for all tanks: Suitable for coldwater, tropical, and marine setups. Easy to use: Comes with a built-in measuring chamber. Supports high stocking: Enables higher fish numbers by improving filtration capacity.