# K090885: Nephros, Inc., Dsu Dual Stage Ultrafilter

- Pathway: 510(k) (Traditional)
- Applicant: Nephros, Inc.
- Decided: Jun 29, 2009 after 90 days
- Product code: FIP (Subsystem, Water Purification)
- Device class: 2
- Regulation: 21 CFR 876.5665
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
Longest line of descent: 1 generation back to K983126 (1999). 1 ancestor in all.
6 later devices descend from it; 1 cites it directly.
0 of 8 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- K983126: Fiberflo Hollow Fiber Capsule Water Filters, Minntech Corp. (1999) Summary page 1.

## Most influential descendants
- K112314: Nephros Olpur H2H Hemodiafiltration (HDF) Module and Olpur MD 220 Hemodiafilter (2012), 5 descendants of its own
- K231534: 5008X Hemodialysis System (2024), 2 descendants of its own
- K243505: 5008X Hemodialysis System (2025), 1 descendant of its own
- K210575: HDF Assist Mudule, HDF Infusion Set and Substitution Filter (2022), 1 descendant of its own
- K251851: DIASAFEplusUS (F00013010) (2025), 0 descendants of its own

## Indications for use
The DSU Dual Stage Ultrafilter is intended to be used to filter water or bicarbonate concentrate used in hemodialysis devices. The DSU Ultrafilter assists in providing hemodialysis quality water or bicarbonate concentrate. The device is not a complete water treatment system, but serves to remove biological contaminants. Therefore, it must be used in conjunction with other water treatment equipment (i.e., RO, DI, etc.).

Source page: https://510kreport.com/device/K090885
Methodology: https://510kreport.com/methodology