EasyClear 4'in1
Ultra-Violet Water Clarifier 1000 to 4000
Bioforce 250 UVC filter (pre-2002 model only)
Bioforce 500 UVC filter (pre-2002 model only)
Bioforce 1000 UVC filter
Bioforce 2000 UVC filter (pre-2002 model only)
Vorton 500 (pre-2006 model)
Vorton 1000
Vorton 2000 (pre-2006 model)
Vorton 4000 UV clarifiers (2 bulbs required)

For optimum performance replace UV bulb annually.