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General Engineering Science Fair Project

Comparing Aquarium Filters

Comparing Aquarium Filters | Science Fair Projects | STEM Projects
In this experiment, you will compare two types of aquarium filters: sponge and under-gravel. You will measure the pH and ammonia content of the water in each aquarium over four weeks. Will the sponge filter be more effective?


The hypothesis is that sponge aquarium filters are more effective than under-gravel filters.

Method & Materials

You will set up two aquariums with different types of filters, add three goldfish to each aquarium, and feed them the same amount of food each day. You will measure the pH and ammonia content of the water in each aquarium once a week for four weeks.
You will need six goldfish, two fish aquariums, fish food, water, a sponge filtration system, an under-gravel filtration system, and a freshwater test kit.


The results showed that the sponge filtration system effectively maintained a lower pH value and also a lower ammonia content in the water, compared to the aquarium using the under-gravel filtration system.

Why do this project?

This science project is interesting because it shows how different types of aquarium filters can affect the water quality in the tank.

Also Consider

To improve the reliability and accuracy of the results, a larger sample of participants should be used. This science project can also be repeated with different types of filters like the power filter or canister filter.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

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