Because It's the Cup.

I thought a short information session on how ice rinks maintain their ice would be fitting, since it's the Stanley Cup and all.

All NHL Ice Rinks have certain engineering and maintenance requirements to maintain if they want to have an NHL team use their rink. Essentially, ice rinks are run by one big refrigeration systems that includes a pump system, compressor motors, HVAC, and controls.

Here is the layers of an ice rink:

A quick overview: 

The compressor motor brings gas in from the outside and then is pushed in side the pipes that run next to the pipes with the brinewater in order to cool it down. The gas cools the liquid down and that liquid is sent into tubes underneath the floor. The tubes begin at the center of the floor and branch off like tree branches underneath the ground every 8 to 10-inches. The liquid in these tubes allow the ground to cool down to a whopping 16 F, leaving the floor at the necessary 22-24 F for the ice to stay frozen during the hockey game.

The brinewater (antifreeze agent) is pumped (B) into the pipes embedded in the ice-bearing concrete slab (C). The ice-bearing slab sits between the skating surface (D) and a layer of insulation (E), which allows the ice to expand and shrink as temperatures and time demand. The brinewater helps keep the ice-bearing slab's temperature just below 32 F so that the water spread onto it can freeze. (Picture and facts compliments of Howstuffworks)

In order to get the ice formed, the pump systems pumps roughly 9,000 gallons of water onto the ice-bearing slab, which then goes through a series of wash downs and freezing to achieve the best sheet of ice. This is just the bare basics I was able to get from Howstuffworks Ice Rinks and American Airline's Rink.

So while you're watching the playoff game tonight at TD Garden, remember they have to do this process every time they want a new logo on the ice!

GO BRUINS!!