A Sustee refill is the biodegradable, replaceable inner core that keeps your Sustee moisture meter working accurately. The outer casing is reusable, so you only need to replace the inner refill when it reaches the end of its working life.
When Do I Need a Refill?
A Sustee refill will usually last around 6–9 months, depending on your watering habits, plant and growing environment.
It’s time to replace the refill when the indicator stops changing colour, stays permanently blue or white, or simply doesn't seem to be responding as it used to.
How Do I Replace a Sustee Refill?
- Remove Sustee from the pot and gently brush away any soil.
- Twist off the Top Cap and End Cap.
- Remove the old inner core, including any remaining material from the End Cap. Wash and dry the parts thoroughly.
- Prepare the new refill core. Do not remove the Straw & Sheet wrapped around the core — this is essential for the colour-changing function.
- Insert the new core from the top, with the straw and indicator wrapper at the top.
- Position the Straw & Sheet at the indicator window, then replace the Top Cap.
That's it! Your Sustee is ready to go again. If your Sustee doesn't turn blue like they normally do, your new core might need priming. See Troubleshooting.
Replace the refill, not the whole meter — a simple way to keep your Sustee working and reduce waste.