This is the annual pack that does NOT include the membrane specifically for the Nimbus 6-Stage.
You can determine if you have the 4 stage by looking at your system and seeing if you have 1 green cap, 1 blue cap, and 1 white cap filter.
The recommended annual replacement filters for the Nimbus 4-Stage are:
Every 2-5 Years the membrane should be replaced (white capped filter)
- 1 Green Cap Filter
- 1 Blue Cap Filter
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