If you are trying to work out which Aquaphor replacement filter, membrane, or service kit you need, this page is here to make the decision simple. Aquaphor reverse osmosis systems use different cartridge combinations depending on the model, and this is exactly where customers often buy the wrong part.
Use the guide below to identify your system, understand what each filter does, and choose the correct replacement product for your setup.
Find the Right Fit
Match your Aquaphor system to the correct filter set or membrane before ordering.
Avoid Wrong Purchases
RO membranes and cartridge sets are not interchangeable across every model.
Maintain Full Performance
Using the correct replacement stages helps protect water quality, taste, and membrane life.
Start Here: Which Aquaphor System Do You Have?
Your first job is to identify the Aquaphor system model, not the filter shape. Once you know the system, the right replacement path becomes far easier.
Aquaphor RO 101S
This configuration typically uses K5, K2, K7M and the RO 50S membrane.
Aquaphor RO 102S
This system uses the higher output RO 100S membrane and a compatible cartridge configuration depending on the model variant.
Aquaphor RO 202S
This configuration uses K1, K2, K7BM and the RO 100S membrane.
What Does Each Aquaphor Filter Do?
K5: Mechanical pre filtration stage that helps remove sand, silt, rust, and larger sediment. This protects the rest of the system from particle load.
View K5 Replacement FilterK2: Carbon based primary purification stage that helps reduce chlorine, organic impurities, and fine particles before the membrane stage.
View K2 Replacement FilterK1: Dual function first stage cartridge used in certain Aquaphor RO configurations. It combines advanced pre filtration and dissolved impurity reduction in one unit.
View K1 Replacement FilterK7M: Final conditioning and mineralisation stage used in K5 based systems, helping improve taste and support drinking water balance.
View K7M Replacement FilterK7BM: Final conditioning stage used in K1 based systems, helping refine taste and finish the purified water properly.
View K7BM Replacement FilterWhich Aquaphor Membrane Do I Need?
This is where people most often get it wrong. The membrane is not just another filter. It is the stage that handles deep purification and hardness reduction, so getting the correct membrane matters.
RO 100S Membrane
Used in higher output systems such as RO 102S and RO 202S.
View the RO 100S MembraneDo You Need Individual Filters, a Set, or a Full Kit?
Choose Individual Filters If
You know exactly which stage needs replacing and only want that individual part.
Choose a Filter Set If
You need to replace the cartridge stages together but not the membrane.
Choose a Full Replacement Kit If
You want the simplest route and prefer to refresh the full system in one purchase.
Quick Decision Guide
I have an RO 101S. What do I need?
Start with the K5, K2 and K7M filter set, and pair it with the RO 50S membrane if the membrane also needs replacing.
I have an RO 102S. What do I need?
You will usually be looking at the RO 100S membrane and the appropriate compatible cartridge set for your system configuration.
I have an RO 202S. What do I need?
You are generally in the K1, K2, K7BM plus RO 100S membrane path.
I do not know what I need.
Do not guess. Use your system model first, then match it to the correct set or membrane. That is the whole point of this page.
Why This Matters
Aquaphor filter purchases go wrong when customers shop by appearance instead of compatibility. That is how people end up buying the wrong membrane, missing the final conditioning stage, or replacing only part of the system when they really needed a full refresh.
This guide exists to stop that. It should reduce wrong purchases, improve trust, and make it easier for customers to move from confusion to the correct product quickly.
Aquaphor Filter Compatibility Table
Use this table to match your Aquaphor reverse osmosis system with the correct cartridge set and membrane. This is the fastest way to avoid buying the wrong replacement parts.
| Aquaphor System | Pre Filter Stage | Primary Filter Stage | Final Conditioning Stage | RO Membrane | Best Matching Product Links |
|---|---|---|---|---|---|
| RO 101S | K5 | K2 | K7M | RO 50S | |
| RO 102S | K5 | K2 | K7M | RO 100S | |
| RO 202S | K1 | K2 | K7BM | RO 100S |
Explore all Aquaphor systems: View Aquaphor range
Need Help Choosing the Right Aquaphor Filter?
If you are still unsure which Aquaphor replacement filter, membrane, or kit you need, speak directly with one of our specialists before ordering.
Call: 0121 630 1130
Contact Regal Flow Support
