• A bio sponge filter is a simple aquarium filter that uses a porous sponge to grow beneficial bacteria and clean the water. It works with an air pump that pulls water through the sponge while producing bubbles.

  How It Works

• Air pump pushes air through a tube in the filter.

• The rising bubbles pull water through the sponge.

• The sponge traps debris (mechanical filtration).

• Beneficial bacteria grow in the sponge and break down toxic waste like ammonia (biological filtration).

• Why It’s Called “Bio”

• The sponge provides a large surface area for beneficial bacteria. These bacteria convert:

• Ammonia → Nitrite → Nitrate

• This process is the aquarium nitrogen cycle, which keeps fish safe.

  Advantages

  ✔ Very cheap and durable
  ✔ Excellent biological filtration
  ✔ Safe for shrimp and baby fish (fry)
  ✔ Gentle water flow
  ✔ Easy to clean

Disadvantages

✖ Not very strong mechanical filtration
✖ Needs an air pump
✖ Visible inside the tank (less aesthetic)

Best For

• Betta tanks

• Shrimp tanks

• Breeding tanks

• Small aquariums

• Quarantine tanks

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  Cleaning

• Remove the sponge.

• Rinse it in old tank water (not tap water).

• ⚠️ Using tap water can kill beneficial bacteria.

• Squeeze gently to remove dirt.

• Put it back.