We recommend that our customers keep their Lilos out of the water when not in use. This prevents two things; The Lilo’s covers rubbing against rough pool edges and developing general wear and tear The buildup of mold and mildew The inner pressure of your Lilos will naturally change with time and temperature change. We recommend routinely topping up the air with the air pumps provided with their order. Should there be rapid air loss without the above environmental factors, please refer to our warranty page for more information.