CTO carbon block
Stage 3 — taste, odour and fine particles.
Cartridge prices are quoted on request — they move with each shipment, and we will not publish a number that is stale within weeks. We confirm it before any commitment, or it sits inside the annual service contract at a fixed price.
What this stage does
A compressed carbon block at the third stage. Finer than granular, it catches the remaining chlorine, taste and fine particles immediately before the membrane — the last line of defence in front of the most expensive part.
How you know it is overdue
- Taste does not improve even after changing the first two stages
- Less water produced over a day
Why a range and not one number?
Because what uses a cartridge up is the volume of water passing through it and what that water carries — not the calendar. A household of six gets through one faster than a household of two, and a tank collecting more sand shortens it further. We write the reading down at every visit, so by the second or third we know your home's actual rhythm instead of guessing.
Fits these systems
If your system is on this list, this is the right cartridge.
The rest of the set — RO kitchen filter cartridges
- PP sediment 5µEvery 4–6 months
- GAC carbonEvery 4–6 months
- RO membraneEvery 4–6 months
- Post-carbon polishEvery 4–6 months
- Alkaline cartridgeEvery 24 months
- Mineral cartridgeEvery 24 months