Cartridge finderPentair Dynamic Series IV DSF 35
What cartridge fits my Pentair Dynamic Series IV DSF 35 spa filter?
Also labeled: DSF35, Dynamic Series IV DSF35.
DSF 35 uses one of two nearly identical cartridge pairs. The bottom opening measurement separates them.
Illustration — use the written checks to confirm compatibility.
Find the right replacement path
What is the bottom opening diameter?
Choose the answer you can confirm from the filter or old cartridge.
Your replacement path
PRB17.5SF-PAIR
- Applies when
- The bottom opening is about 2⅛ inches.
- Outside diameter
- 5 in
- Cartridge length
- 4 5/8 in
- Bottom opening
- 2 1/8 in
This identifies the compatible profile. Confirm the printed part number when available before ordering.
Your replacement path
PRB17.5SF-JH-PAIR
- Applies when
- The bottom opening is about 2³⁄₁₆ inches.
- Outside diameter
- 5 in
- Cartridge length
- 4 5/8 in
- Bottom opening
- 2 3/16 in
This identifies the compatible profile. Confirm the printed part number when available before ordering.
Not sure yet
Check these details before choosing
- Measure the bottom opening: the two published profiles use 2⅛ inches or 2³⁄₁₆ inches.
- Confirm the cartridge is a two-piece pair about 4⅝ inches long per piece.
Do not choose a replacement until one path can be confirmed.
Sources and review date
Record reviewed 2026-07-26.