XSPC Bay Reservoir
 

One of the hardest parts of maintaining a water cooling system has to be the removal of air bubbles. When filling the system with water, air gets trapped in components and can cause reductions in the performance of your system. In addition to this, air bubbles passing through your pump often get broken down into smaller bubbles and mix with your coolant to create a thick foam.

Water cooling companies such as Danger Den came up with a simple solution to this problem and named it a 'Reservoir'. Essentially a Plexiglass box, the Reservoir also featured an internal divider which assisted in the reduction of turbulence in the water and aided the removal of bubbles. Other advantages included easier filling and draining of your water loop, as most reservoirs feature a filler cap.