Short answer: yes. But if you ask any expert smoker you know, they won't suggest you do it. Instead, you need to change the water in the base every session with the hookah. It is only for the freshness and coolness of the hookah. Hookah base water will absorb all the impurities and harmful chemicals from the smoke. If you continue using the same old water from the previous hookah session, it won't absorb more chemicals as it should. So, changing the base's water for every hookah session is highly advisable.