The HIAC PODS+ has three different sampling modes, Bottle Mode, Online Mode and Filter Cart Mode. The Bottle Mode is for sampling fluid that is contained within a bottle and then the bottle is placed in the sample cup chamber. Online Mode is when you connect the HIAC PODS+ directly to a system and the instrument makes measurements periodically. Filter Cart Mode is identical to Online Mode but with added features, like controlling an external device or simply turning a light on when the fluid becomes dirty. Knowing the differences between Online Mode and Filter Cart Mode will allow operators to get the most out of their PODS+.