This is 20 mil CleanSpace liner. It keeps water and moisture vapor out of your crawl space. Moisture and water lead to mold, wood rot and make it easy for critters to live under your home.
In the back of the photo, you can see the pier on the left. We wrap piers in CleanSpace liner to make sure no moisture comes into the crawl space.
The big blue thing is the SaniDry CX dehumidifier. It is not "normal" and can not be purchased at a home improvement store. It is industrial strength and ensures that crawl spaces stay dry all the time. The smaller black box is a condensate pump, it helps move the water vapor collected by the SaniDry CX to the sump pump; then out of the area.
The SmartSump collects the water from the SaniDry CX and pumps it away from the house. The red hockey puck looking thing is a WaterWatch Alarm. It will alert you if water comes into the sump pump through the top. Example: if there was a plumbing leak and water ended up in the crawl space.
Photos from a recent CleanSpace encapsulation project in Swainsboro, GA.