We recommend that you replace your rattan reeds every 3-6 months. This is because after continuous use the oils can start to clog the channels within the reeds that dispense the fragrance. Our reeds are made of natural rattan which is the best material that you can use for dispensing fragrance due to the natural channels with in the reeds. **Be aware of replacing your reeds with cheaper 'Fiber or Bamboo' reeds which are less superior to rattan as they do not have the hollow channels that rattan do making it harder for the oils to travel up the sticks.