Below are the filter codes associated with each filter. 

75i

• 75i Pure is B7-Pure or B7-Essential
• 75i Fresh is B7-Fresh or B7 Advanced
• 75i Odor is B7-Odor or B7-Ultimate (Previously CC-Odor)

45i

• 45i Pure is B4-Pure or B4-Essential
• 45i Fresh is B4-Fresh or B4-Advanced
• 45i Odor is B4-Odor or B4-Ultimate
• 45i VOC/Smoke was B4-VOC (Formerly FL-40) VOC/Smoke filter has been discontinued. 

35i

• 35i Pure is B3-Pure or B3-Essential
• 35i Fresh is B3-Fresh or B3-Advanced
• 35i Odor is B3-Odor or B3-Ultimate 

25i

• 25i Pure is B3-Pure or B3-Essential
• 25i Fresh is B3-Fresh or B3-Advanced
• 25i Odor is B3-Odor or B3-Ultimate

Classic

• Classic Pure is BF35-Pure
• Classic Fresh is BF35-Silver Carbon
• Classic VOC/Smoke is BF35-VOC
• Classic Odor is BF35-MP or BF35-Odor

Fit50

• Fit50 Pure is FF50-Pure
• Fit50 Fresh is FF50-Silver Carbon or FF50 Fresh
• Fit50 VOC/Smoke is FF50-VOC
• Fit50 Odor is FF50-MP

T500

• T500 Pure is TF60-Pure
• T500 Fresh is TF60-Fresh
• T500 Odor is TF60-CC-Odor

T100/T300

• T100 Pure is TF15 (Filter discontinued)
• T100 Fresh is TF30 (Filter discontinued)

A350/A375

• A350/A375 Pure is BF15A
• A350/A375 Fresh is BF25A (Filter discontinued)

Paralda

• Paralda Pure is TF50-Pure (Filter discontinued)
• Paralda Fresh is TF50-Carbon (Filter discontinued)