In membrane filtration, one common practical question is whether the membrane must be pre-wetted with saline before filtering a sample. This is especially relevant in microbiological testing and bioburden analysis, where filter performance and organism recovery are important considerations. Kumpulan Saintifik (KSFE). (n.d.). Membrane filter, PTFE (hydrophobic) [Photograph]. Retrieved July 30, 2026, from https://www.ksfe.com.my/files/product_image/603/1562649912-l.jpg Is Pre