Osmio · DO10PRE
Three replacement pre-filters for your Osmio RO system
Refresh the sediment and carbon stages that treat incoming water before it reaches the reverse osmosis membrane. The DO10PRE pack includes a 5-micron sediment cartridge, a granular activated carbon cartridge and a carbon block.
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Three pre-filters
Refresh stages 1–3 together.
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5-micron sediment
Catches particles before the carbon stages.
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Two carbon stages
Granular carbon followed by a carbon block.
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Six-month HT+ schedule
Plan routine pre-filter changes.
Compatibility and pack contents
Check the three stages before you order
This pack is for the Osmio DO range. It matches the three pre-filter stages used in the Osmio HT+ Home & Office and Lab & Dental systems. For other RO systems, check the housing and cartridge specification for each stage.
If the membrane or final cartridge is due for replacement, order those separately. Choose the final cartridge that matches your system.
- Pack reference
- DO10PRE
- Stage 1
- 1 × 5-micron polypropylene sediment cartridge for suspended particles
- Stage 2
- 1 × granular activated carbon (GAC) cartridge to reduce chlorine
- Stage 3
- 1 × CTO carbon block for further chlorine and fine particle reduction
- Feed water
- Microbiologically safe cold water
Replacement and servicing
Fit the cartridges in order and flush before use
Osmio recommends replacing the first three HT+ filters every six months. For other compatible systems, use the service schedule and fitting instructions for your model.
- Shut off the feed water. Disconnect power if your unit is powered and open the drinking tap to relieve pressure.
- Fit each cartridge in its matching housing in this order: sediment, granular carbon, then carbon block. Follow your system manual for the housing seals.
- Restore the supply and check for leaks. Flush the new cartridges for at least 10 minutes as directed for the pack, then discard the flush water.
- On the HT+, follow the controller instructions for the F1 filter indicator and keep a record of the service date.
Manufacturer instructions
Read the HT+ manual before servicing
Use the pre-filter installation and servicing sections to check housing seals, cartridge order and the F1 controller instructions.
Helpful answers
Frequently asked questions
Will this fit the Osmio HT+ Home & Office and Lab & Dental?
Both HT+ models use the same three pre-filter stages. The final cartridge differs between models, so match that part to your system if it is also due for replacement.
Will it fit a different reverse osmosis system?
The pack is listed for the Osmio DO range and may fit other systems with matching housings. Check the cartridge dimensions and your system’s approved filter specification before ordering.
Does the pack include an RO membrane or a post-filter?
The pack contains the three pre-filters. The RO membrane and final cartridge are sold separately.
How often should I replace the pre-filters?
Osmio’s HT+ service schedule recommends replacing all three pre-filters every six months. For another compatible system, follow its own maintenance schedule.
How long should I flush the new cartridges?
The pack instructions specify a flush of at least 10 minutes before use. Follow the flushing procedure for your system and discard the flush water.
Which indicator do I reset on the HT+?
Follow your controller instructions for F1, the filter-life indicator. F2 tracks the RO membrane separately. If you change only the pre-filters, keep a separate record of when the final cartridge is due.
Friendly product support
Need help choosing the right pre-filters?
Send Regal Flow the model number and a photo of your existing cartridges or housings. We can help you check the pack before you order.