Chakra Meditation - Bhuta Shuddhi (Purifying the 5 Elements), by Swami Jnaneshvara Bharati

Bhuta Shuddi is an ancient Chakra Meditation of Yoga and Tantra practice through which the five elements (bhutas) are balanced or purified (shuddhi). This is a very useful practice, whether you think of it as preparation for Kundalini awakening, or simply as a practice for feeling balanced, centered, or tranquil, etc. (One of the two foundations of Yoga is Abhyasa, practices seeking of tranquility; Yoga Sutras). For the Chakra Meditation of Bhuta Shuddhi, it is necessary to understand how the five elements relate to the chakras. The five bhutas are the five elements of earth, water, fire, air, and space, and they operate in conjunction with the lower five chakras (at subtle level they are called tanmatras, which are part of tattvas, or subtle constituents). The sixth chakra is of mind, and is beyond or prior to the bursting forth of space, air, fire, water, and finally earth. Consciousness itself (or whatever you want to call it) is prior to, or the source of manifestation of mind, and is the seventh chakra (surely there are other chakras, including between sixth and seventh, but the bhuta shuddhi practice itself need not focus directly on these).
Alignment of the five elements: The five elements align with, and operate from the five lower chakras, along with the ten indriyas and a seed mantra for each।. In systematic Chakra Meditation, you progressively move attention through the chakras, along with awareness of the nature of each chakra.
Method of practicing Chakra Meditation - Bhuta Shuddhi: There may be many methods of purifying the five elements, ranging from meditative practices (including Yoga Nidra) to various forms of ritualistic practices. With some reflection it makes sense how it is that many practices might have such an effect. The Chakra Meditation method presented below (Bhuta Shuddhi) works directly with attention on the chakras, balancing the subtle forces of the five elements through the use of the bija (seed) mantras of the chakras. Before doing the Chakra Meditation - Bhuta Shuddhi practice itself, it is useful to do some stretches or hatha asanas (postures) followed by some form of physical and psychic relaxation practices. This helps prepare the mind to be able to focus on the chakras.