• coleman Spas
• Costco Spas
• Hotspring Spas (Simply unscrew the suction stand pipe, then the 1 3/4 inch fine thread is underneath)
  
• Hotspring LIMELIGHT Spas (Simply unscrew the suction stand pipe, then the 1 3/4 inch fine thread is underneath)
• hydro Spas
• Infinitas Whirlpools (Natural Spa)
• Maax Spaswith thread (without toploader see variant)
• vita Spas
• Wellis (see also Wellis subpage, because there are three types of filters for Wellis)

consisting of 1-5 Ego3 filter cartridges (depending on variant) + 1 pack EGO3 filter balls (approx. 10 refills), with this you can fill a filter for 8-10 years to fill a filter!

Connection 1 3/4" male thread fine - ID=38mm; AD=45mm

You can select the number of filters you need in the drop down menu: