OASEIndoor Aquatics Pre-Filter Foam Set of 6 for The Biomaster 30 Ppi, Black

It baffles me that the Biomaster filter chose to include the finest sponges for the intake area, rather than the output! As others noted, the super fine sponges picked up lots of debris and predictably clogged up, reducing flow rates noticeably. The new filter sponges replaced the originals nicely, and are doing a great job. Oase just needs to make these prefilter sponges in the largest diameter sponge (blue), and put the finer sponge material in a tray just before the water is returned to the tank.

I resume with the following statement: Oase brand is to be trusted. Their products and quality are excellent. Not only for those sponges, but in general. I know, it's a bit pricey but they really do the dirty work on my filter, so I give them 5 stars and thumbs-up !!

These are more coarse and clog less often for pre filter. I wished there was an option slightly more coarse. After a year, I had to replace them as they lost their shape in the filter.

These significantly reduced (eliminated so far) the noise from my filter

Very good 👍

VERY GOOD

This is a must have for the OASE canister filters. The 60ppi sponge that comes with them clogs up too fast for most systems. 30ppi last much longer while still doing a great job of pre filtering the water.

Much too coarse for my tanks. And contrary to several YouTube recommendations, I found no increase in flow rate using these 30 ppi foams versus the 50-60 fine grades.