These filters are special made for water coolers.
3 stage 20" Slim Line - For Water Coolers and Pressure Lines 

• 20" Slim Line filter housing with pressure relief valve
  cost effective long-term operation
• simple installation
• high flow design and extremely low pressure drop
• easy to replace filters - handy spanner wrench included with all systems
  
  
  Specifications:
  
  
  • (Stage 1) 5 Micron Sediment Filter :
    With only five micron rating. It is effective in removing dirt, rust and sand particles.
    
    
  • (Stage 2) Granular Activated Carbon Filter:
    It takes out 99% of the chlorine and organic chemicals. It provides enhanced reduction of taste, odor, and color.
    
    
  • (Stage 3) Carbon Block Filter: 
    0.2 micron Filter removes Tiny Impurity, bacteria and virus.