The inner core of SUSTEE is made of natural fibres. We recommend replacing the core when it stops turning blue after watering(approximately after 6-9 months).
Twist the top of the Sustee stick open, remove the used core, insert a new core then close the top.
Keep the refill in the product package until just before use. Once taken out of the bag, the refill's core material may discolour.
Each pack comes in a set of two core refills.
Please note that this product is inner refills only.
