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https://www.swelluk.com:443/biomaster-replacement-foams/ 
Oase BioMaster Replacement Foams
Oase BioMaster replacement foams are suitable for the BioMaster Filter and the BioMaster Thermo. Available in fine and course to give you the clearest of aquarium water.
Products
Product Information
Replacing filter foams is essential to help maintain a health, clean aquariums. There is no set rule for when your need to replace filter foams in aquarium filters, however, there are some signs such as dirty water circulation, poor water quality and reduction in flow from your filter that help indicate when this needs doing. Although a foam may look fine in appearance, it may have shrunk over time allowing debris to pass this stage of the filter so its advised always having a spare handy to compare.
These foams are seated within the pre-filter section of the BioMaster external filter. as standard the filter comes with the course blue foams, however, there is a fine foam available which is used to catch the finest or particles.
| 250 & Thermo | 350 & Thermo | 600 & Thermo | |
| 45271 Hel-X 13 Biomedia 800ml | x1 | x1 | x2 |
| 45270 Foam 30ppi Orange | x1 | x1 | x1 |
| 45269 Foam 20ppi Blue | x1 | x2 | x3 |
| 46481 Pre-Filter Foam set 4 30ppi | 1 Set Only | 1 Set Only | N/A |
| 45265 Pre-Filter Foam Set 4 45ppi | " | " | N/A |
| 45266 Pre-Filter Foam Set 4 60ppi | " | " | N/A |
| 46482 Pre-Filter Foam Set 6 30ppi | N/A | N/A | 1 Set Only |
| 45267 Pre-Filter Foam Set 6 45ppi | N/A | N/A | " |
| 45268 Pre-Filter Foam Set 6 60ppi | N/A | N/A | " |
Please note that the Pre-Filter Foam set 4, only one set is required for the 250 & Thermo and the 350 & Thermo. The grade of foam (ppi) is the coarse rating you are selecting. The higher the ppi, the more coarse the foam is. Same applies for the 600 & Thermo.