Do not replace with a rubber hose, shorten, lengthen, turn the hose around, or remove the end clamps. Periodically blow out hose and probe with compressed air. If the probe leaks, spins at the connection, is bent, has a loose handle, or has holes plugged replace it or have it repaired. Filters should be white at all times. In some cases filters can be washed and reused, but most of the time they should be replaced.
Filters protect the system's pump and gas bench.
Examine the ventilation fan and filter for the computer. Check the manual for procedures for maintaining. Questions regarding these tips should be directed to your equipment manufacturer.