Hailea Internal Filter The Hailea Internal Filter (often referred to in product lines like BT‑200, BT‑400, BT‑700 or BT‑1000) is a submersible internal aquarium filter meaning it sits inside the tank and helps keep the water clean and healthy for your fish and plants.  How It Works Internal filters like this pull water from the aquarium, pass it through media (sponges, carbon, etc.), and then return the cleaned water back into the tank. They typically offer three types of filtration: Mechanical filtration: traps solid particles and debris. Biological filtration: provides space for beneficial bacteria that help break down harmful ammonia and nitrites. Chemical filtration: activated carbon media removes impurities and odors.  Key Features Submersible: fully underwater and attaches inside the tank, usually with suction cups. Aeration: many models also help oxygenate the water as it circulates. Durable construction: often made with reinforced ABS plastic and sealed motors to prevent leaks and long‑term wear. Energy efficient: power usage varies with size (from ~3–20 W depending on model).  Choosing the Right Size Internal filters come in different power/flow ratings: Smaller models (e.g., ~200–400 L/h) are good for nano or small aquariums. Larger ones (e.g., ~1000 L/h) work well for medium tanks.  Why Use One An internal filter is a great solution if you want: A simple, compact filter that doesn’t require plumbing outside the tank. Better water clarity and oxygenation for your fish and plants. A system that’s easy to install and maintain perfect for beginners.

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