Ashless filter paper is the correct option.
- The process of turning unusable water into drinkable (potable) water is known as water purification. Since water creates an excellent solvent, getting pure water without treatment is challenging.
- Coarse filtering is used in the initial stage to get rid of big foreign objects. By letting the water pass through a mesh screen, this is accomplished. Sedimentation is the subsequent phase. To allow for the separation of tiny particles, the water is left to stand. Aluminum sulfate and calcium oxide in the water help in this process. Aluminum hydroxide reacts with some of the water to generate a gelatinous substance. The slow-moving gelatinous precipitation drags down particles as it settles.
- Following aeration, the water is filtered through a fine sand bed to oxidize dissolved organic molecules. Sterilization of the water is the last step. This is frequently done by bubbling chlorine gas through the water, which creates a mild acid that kills any germs that are still present. In this procedure, ozone can also be employed in place of chlorine.
Therefore, option a. is correct.
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