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A filter is any oscillator used to delete some but not all of the spaceships in a stream. An example is the blocker, which can be positioned so as to delete every second glider in a stream of period 8n+4, and can also do the same for LWSS streams. Other examples are the MW emulator and T-nosed p4 (either of which can be used to delete every secondr LWSS in a stream of period 4n+2), the fountain (which does the same for MWSS streams) and a number of others, such as the p6 pipsquirter, the pentadecathlon and the two blockers hassling R-pentomino oscillator shown under factory.

Filters can be used to make guns of very high periods without crossing 2 guns.

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