Water Spray from Truck in Highway DT10 (Long An Province)

Another video taking place on Highway DT10 in the Long An Province on the way to Duc Hoa, Vietnam. I was riding behind this truck when I noticed a spray of water. I was trying to pass it since the spray kept hitting my visor but as you can tell from the video, it was not that easy. It took me about two minutes but I finally got around him. It never occurred to me to tell the drivers of the water leak. Well, was it really a leak?

Video below.