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https://www.swelluk.com:443/swell-premium-filter-pump-replacement-impeller/ 
Swell Premium Filter Pump Replacement Impeller
Replacement Impeller for the Swell Premium Filter Pump 3000 - 18000.
Products
Product Information
The Impeller is the rotating part inside the filter which keeps water flowing smoothly. They are very durable but will eventually need replacing, as over time they can break, stopping your filter pump from functioning as well as it should.
Impellers are a moving part of the product and are not covered under warranty.