Turn over to begin the diffusion cycle. Do not turn hourglass over during a diffusion cycle (approximately 1 hour). Once the diffusion cycle is finished, wait at least 30 minutes before turning hourglass over. Ideal for spaces less than 20 square metres in size. To refill, simply remove the cap from the refill and screw it onto the part of the bottle with the diffusion system. We also strongly advise not to place the diffuser directly on surfaces such as wood, old paintings and marble.