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https://www.swelluk.com:443/oase-filtosmart-replacement-foams/ 
Oase FiltoSmart replacement foams
Products
Product Information
The full range of replacement foams for the Oase FIltoSmart External filters and the Oase FiltoSmart Thermo External Filters.
We recommend these should be changed every 6-8 week but cleaned more frequently, remember never to clean the foams in tap water and only waste water form the aquarium.
These foams fit the Oase FiltoSmart 60, 100, 200 and 300 models. Always remember to add in filter bacteria when you full replace the foams.