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Guides

Filter replacement for the reverse osmosis system – when and how

by Noventra Intertrade GmbH on Oct 01, 2026

Regularly changed filters are crucial for the water quality and service life of your osmosis system. The pre-filters are changed approximately every 6 to 12 months, depending on water quality, and the membrane is also changed approximately every 12 to 24 months, likewise depending on water quality.

Why changing the filter is important

The pre-filters retain particles, chlorine, and taste-impairing substances, thereby protecting the sensitive membrane. If they are exhausted, their effectiveness decreases and the membrane is subjected to greater stress. The result: the water tastes less fresh, performance drops, and the membrane must be replaced sooner.

When is it time for new filters?

  • By interval: Pre-filters approximately every 6 to 12 months, the membrane or the all-in-one filter of the INFINITY PRO approximately every 12 to 24 months – depending on water quality. Sooner if the water is hard or heavily contaminated. Note the date of the last change.
  • In case of noticeable changes: The water flows more slowly, tastes different, or the system runs longer than usual.
  • After a long break: If the system has been idle for several weeks, for example after a vacation, flush it thoroughly and check the condition of the filters.

How to change the filters

  1. Switch off the system or disconnect it from the power supply and, for under-sink units, turn off the water supply.
  2. Remove the old filter according to the instructions. A cloth underneath will catch residual water.
  3. Insert the new original filter until it audibly clicks into place or is firmly seated.
  4. Turn on the water supply, switch on the system, and check for leaks.
  5. Do not drink the first filtered water; instead, flush it out as described in the instructions.

The matching original filters

System Pre-filter Membrane
FLEX AIR 3-in-1 pre-filter RO replacement membrane
RIO AIR 3-in-1 replacement filter Replacement membrane 1000 GPD
INFINITY PRO Multi-layer all-in-one filter included in the all-in-one filter

Original filters are precisely matched to your system and ensure full filtration performance. Questions about the change? Our team is happy to help by phone at +49 5201 1805860 (Mon–Sat 9 a.m.–6 p.m.).

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