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https://www.swelluk.com:443/fluval-pre-filter-media/ 
Fluval Pre-Filter Media
Fluval Pre-Filter media can be used for any of the filter canister models, including the Fluval 104/5/6, 204/5/6, 304/5/6, 404/5/6, FX5, and FX6.
Product Information
The Fluval Pre- Filter media comes in a 750g box, and is designed to capture solid waste particles before they reach other media. This prevents the premature clogging of finer filters and extends their life, reducing the frequency of replacing media.
This is a great form of mechanical filter media, which is ideal for medium and coarse filtration.
- Effectively traps medium to large solid waste and debris
- Prevents premature clogging and extends life of subsequent filter media
- Ideal for medium and coarse filtration
- Hollow body promotes even water distribution
- For best results, replace every 6 months
- For use in freshwater and saltwater aquariums