[Jamestown1630]

What was the water we saw spraying on one of the views, about a minute and a half before launch?

[Political Junkie Too]

What was the water we saw spraying on one of the views, about a minute and a half before launch?

From Wikipedia Kennedy Space Center Launch Complex 39:

Sound Suppression Water System

A Sound Suppression Water System (SSWS) was added to protect the Space Shuttle and its payload from effects of the intense sound wave pressure generated by its engines. An elevated water tank on a 290-foot (88 m) tower near each pad stored 300,000 U.S. gallons (1,100,000 liters) of water, which was released onto the mobile launcher platform just before engine ignition. The water muffled the intense sound waves produced by the engines. Due to heating of the water, a large quantity of steam and water vapor was produced during launch.

-PJ

[odawg]

Dumping water on the launch pad to keep it from being burned up.