Abstract: The device, which is a multi-element tube, is adapted for receiving a water sample into a first chamber. The sample is then caused to pass through a relatively coarse filter into a second chamber, where the sample contacts a relatively fine second filter on which a portion of the sample is retained. A stabilizing agent is added to the second filter so that the sample is maintained for later testing. The device can then be sent, at ambient temperatures, intact and in a sterile, sealed condition, via common carrier to a central laboratory, where the portion of the second filter is removed for testing. Thus, the present device is a simple to use and inexpensive means for conducting microbiological testing of samples from remote sites.