homemade aquarium filter

Very simple to make.

Things you need to make this filter.

• Plastic bottle,
• sponge,
• water filter gravel bought at aquarium and pet store,
• air pump and... 
• some pieces of drinking straw cut to pieces (not needed really.I just put them there to float around).

Then I made some holes in the bottle cap-one for the airpump tube and the rest so that the water can get in.Some more holes at the bottom of the bottle for the air to get out.That's it.Pretty simple filter.




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