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Why is an internal water separator drain necessary?

Why is an internal water separator drain necessary?

Update Time:2021-07-02

First, an internal Water Separator Drain (inside of the compressor) is NOT necessary. But it can have some benefits in two cases: 1) Screw without an integrated dryer: Using a water separator drain, we remove some water from the compressed air, before its delivered to the final area of use with less water content. 2) Screw with an integrated dryer: Using it before the dryer, some of the water gets removed before the dryer, this gives the opportunity to choose a smaller sized air dryer.