Thus, such solutions cannot be filtered through standard filter papers. Once sampled, the signal can be digitally filtered and downsampled to the desired sampling frequency. This water is then filtered through a screen and recirculated. That water is then filtered to remove impurities. The oil/water mixture is then filtered and separated by centrifugation. This output would then generally be filtered and amplified for use. The emitted light is filtered and detected by a photomultiplier tube. Typically it is filtered waste-water from sinks and showers. Engine oil is filtered to remove impurities. Aldosterone is responsible for the reabsorption of about 2% of filtered glomerular filtrate. As groundwater flows through an aquifer, it is naturally filtered. The carrier frequency is again filtered, amplified and transmitted. Before the client response can be sent, faulty Outputs must be filtered out. However, manual transmission oil is usually not filtered and accumulates metal particles from normal wear. The fluid is then filtered and re-pumped.