Tunze Osmolator 3
by Tunze — see more →SKU 275936G
- Ships Australia-wide — fast dispatch from Eastwood
- Or collect in store with the rest of your order
- Genuine stock — marine specialists since 2012

Osmolator 3
Automatic top-off that quietly replaces evaporated water, so your salinity stays where you left it.

No more salinity creep
Evaporation doesn't take a day off, and manual top-ups always leave a gap between refills where salinity slowly drifts upward. The Osmolator 3 closes that gap automatically, replacing evaporated water as it's lost.
- ✓Automates daily top-up of evaporated water
- ✓Helps keep salinity consistent instead of drifting between manual top-ups

A name reef-keepers already trust
Tunze has been a mainstay of reef automation for decades, and the Osmolator range carries that same reputation for dependable, no-fuss operation.
- ✓Long-established name in reef automation
- ✓Built for reliable, ongoing operation on tanks of any size

A few minutes to install, then forget about it
Getting the Osmolator 3 running properly is straightforward, and a little care at setup means years of trouble-free top-ups.
- ✓Position the sensor as directed to avoid false triggers from surface agitation
- ✓Check the reservoir regularly so it doesn't run dry unexpectedly
- ✓Test the shut-off function periodically to confirm it's working reliably
At a glance
If you're tired of topping up by hand or watching salinity creep between refills, the Osmolator 3 takes that job off your plate with a brand you already trust. Dry goods ship Australia-wide.
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