For reef tank or fish tanks or saltwater tanks in aquarium, mesh filter socks and felt filter socks are both available.
Normally, the micron rating is 100-200 micron, and the filter socks sizes are from 4*9” to 7*15”, 7*16”, and other sizes.
Mesh filter socks are washable, compared for felt filter socks, it can last a little longer time. But it cannot block fine particles.
Compared with mesh filter socks, when same size and same micron, the felt filter socks cost will be a little lower. And felt filter socks can block fine particles.
As one professional filter socks manufacturer, Shanghai Indro Industry Co., Ltd is manufacturing widely range of mesh filter socks and felt filter socks used in aquarium.
You can choose the most suitable one according to your exact conditions.