How To Refill A Sustee

When do I need to replace the refill?

Sustee refills usually last around 6–9 months, depending on your watering habits, plant type and environment.

It’s time for a new refill if:

  • The indicator stops changing colour

  • The window stays white or blue, no matter how much you water

  • Your Sustee just isn’t responding like it used to

(Think of refills like batteries — they do their job quietly, then eventually need swapping.)

How to replace a Sustee refill

  1. Remove Sustee from the pot and gently brush off any soil.

  2. Remove the Top Cap and the End Cap by twisting them.

  3. Remove the old inner core and be sure to remove any that is left in the End Cap. Then wash and dry all parts thoroughly.

  4. Prepare the new inner core. 

    The ‘Straw & Sheet’ is an essential part that changes the indicator from white to blue and back.

    Please do not remove it and always use SUStee with it in place.

  5. Attach the End Cap, then insert the core from the top.

    Adjust it so that the ‘Straw & Sheet’ is positioned at the indicator. Finally, put the top cap back on to complete assembly.

That’s it! Your Sustee is back on duty 💧

Good to know:

  • The outer case is reusable — only the inner refill needs replacing

  • Replacing the refill keeps your readings accurate and your watering stress-free