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https://www.swelluk.com:443/swell-filter-box-premium-replacement-foams/ 
Swell Filter Box Premium Replacement Foams
Replacement foam sets for the Swell Filter Box Premium, meaning you can keep your water in the best condition by changing your sponges.
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Product Information
Replacement foam sets for the Swell Filter Box Premium, which should be replaced yearly, or as required. These sets contain both the coarse yellow sponges and blue fine sponges, to ensure that as much dirt is captured as possible.
We have the replacement foams for the Filter Box Premium 6000, 10000, 25000, 45000, with the correct number of foams for each model.