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What's your filter for?


An aquarium filter has several jobs to do, but its main purpose is to keep your aquarium clean, clear and healthy for your fish.

An aquarium is a closed system, so dirt and waste remain in the aquarium, turning it into a poisonous sewer without our intervention. This is why a filter is one of the most essential pieces of equipment in your fish tank.

It acts like a mini sewerage treatment works, and cleans up the aquarium water in several ways:

So, take good care of your filter as it is the life support of your aquarium.

Here are some of our top tips for good filter care:

  • It can take up to 8 weeks to establish the biological system in a new aquarium. Add Fast Filter Start to help improve this process.
  • Check your filter every day. Check it’s working properly and clear any dirt or blockages.
  • Look out for evaporation and keep your aquarium topped up to the maximum water level. Always use Bioactive Tapsafe when adding new water.
  • Follow recommended cleaning and maintenance routines – See weekly and monthly care.
  • Add a filter booster treatment, such as Fast Filter Start, when starting your aquarium and when adding new fish.
  • Never clean the biological media in tap water. If it needs a clean, swill the media cartridge in a bucket of aquarium water (when doing a water change).
  • Regularly test your aquarium water. Most problems come from invisible toxins building up; this cannot only damage your fish, but may also cause filtration problems.