A reverse osmosis filter is the solution for water with real problems: excess calcium and magnesium salts, nitrates, brackish water, or a mix of contaminants that a regular filter doesn't cover. The Olympus system runs water through four stages of purification and stores it in a pressure-pumped tank, ready to drink from your own tap.
It is the most complete filter in the Olympus range, with a 2-year warranty and delivery throughout Romania.
When is reverse osmosis worth it?
Reverse osmosis makes sense when water analysis shows something that needs to be removed, not just improved in taste.
Hard water. The reverse osmosis membrane retains calcium and magnesium salts and transforms hard water into soft water.
Nitrates. In agricultural areas, well or well water may contain nitrates. The membrane retains them.
Brackish water. The system retains salt from brackish water so that unsuitable water becomes normal drinking water.
Multiple problems. When water combines several of the above, the four stages cover them all in one system.
If your water comes from the public network and the only problem is the taste of chlorine, a water filter for tapdoes the job with a single cartridge. Reverse osmosis is the next step, for water that demands more.
The 4 stages of purification
| Stage | What is | What does it remember? |
| 1 | Polypropylene cartridge | Sediments, colloids, rust, sludge deposits |
| 2 | Compact activated carbon cartridge | Chlorine, pesticides, asbestos, heavy metals, chemical elements. Improves taste and smell |
| 3 | Reverse osmosis membrane | Microscopic contaminants, calcium and magnesium salts, nitrates, salt from brackish water, colloids, heavy metals, microbes |
| 4 | Activated carbon filter | Refreshes the water stored in the tank the moment you turn on the tap |
Each stage does a different job, and the order matters: the first two protect the membrane, the third does the main purification, the fourth gives the water the final taste.
What do you get?
Olympus Reverse Osmosis Water Filter, 250 €, comes as a complete system:
- The 4 stages of filtration, one cartridge for each
- Water tank with pressure pump, so that purified water is always ready
- Dedicated faucet for pure water, mounted on the sink or countertop
- Pure water flow rate of 150-180 liters in 24 hours, and the tank fills in approximately 3 to 5 hours, depending on the water pressure
The system is mounted under the sink, connected to cold water and the sink drain, and the complete instructions in Romanian are at Instructions for use.
How to mount
The system sits under the sink and has four connection points, each marked with a color: the mains supply, the tank, the pure water tap and the drain pipe to the sink drain. The dedicated tap is mounted on the sink or countertop, through a small hole, like any under-sink filter.
Installation is done according to the manufacturer's instructions, by yourself or with a plumber. Once connected, the tank begins to fill, and pure water is available at the tap within a few hours.
Maintenance: cartridges and membrane
Reverse osmosis is a system with accessible spare parts, each available separately in replacement filters:
- Stage 1, polypropylene cartridge: 4 €
- Stage 2, pressed activated carbon 10″ CTO: 25 €
- Stage 3, reverse osmosis membrane: 47 €
- Stage 4, carbon filter T33: 14 €
If you need an extra or replacement faucet, undercounter and osmosis faucet is 15 €.
What you need to know before
It's for tap water. The system, like all Olympus filters, is intended for connection to water supply networks controlled by authorities, which supply water suitable for human consumption. For wells or wells, water analysis comes first.
It has a leak. The membrane separates the pure water from the contaminated water, which is then discharged through a pipe down the sink drain. This is how reverse osmosis works and why the resulting water is so clean.
The water becomes soft. The membrane retains calcium and magnesium salts. If you want filtered water with the minerals retained, Olympus antimicrobial filters allows mineral salts and trace elements to pass through.
How the principle works, briefly, I explained in Reverse osmosis for the home: how it works and when it's worth it.
Why Olympus
- Made in Greece, in the European Union, by Center Plus SA.
- 2 years warranty for all filters, with technical support
- Spare parts in stock, at clear prices, for each stage
- Delivery by courier throughout Romania, with details at delivery policy
Frequently asked questions
How often are the cartridges changed?
Each stage has its own cartridge and is changed according to the system's operating instructions. All four are available separately at the prices above.
Does reverse osmosis produce wastewater?
Yes. Some of the water, which carries the contaminants retained by the membrane, is discharged through the sink drain. The system connects directly to the drain, via the included pipe.
Can it be installed in an apartment?
Yes, under the sink, with cold water connection and drain. The dedicated faucet is mounted on the sink or countertop.
How long does the tank last?
The tank fills in approximately 3 to 5 hours, depending on the water pressure, and the system produces 150-180 liters of pure water in 24 hours.
Does the reverse osmosis filter have a warranty?
Yes, 2 years warranty, like all Olympus filters, with technical support.
Pure water, from your own tap
For water with salts, nitrates or combined problems, reverse osmosis is the complete answer: four stages, tank with pump and dedicated tap, in a single €250 system.
See Olympus reverse osmosis water filter or start from choosing the right model.
