What is the primary purpose of regular backwashing?

Regular backwashing is primarily conducted to clean filters and ensure proper water flow within a pool's filtration system. Over time, filters accumulate dirt, debris, and contaminants, which can obstruct water flow and reduce the filter's effectiveness. By backwashing, the flow of water is reversed through the filter, dislodging and flushing out the accumulated contaminants. This process helps maintain optimal filtration efficiency and water clarity.

The other options do not fulfill the main objective of backwashing. Adding chemicals to the water typically occurs during routine maintenance but is not a function of backwashing. Checking water levels is essential for ensuring proper pool operation but is not related to the backwashing process. Warming the water temperature can be beneficial for comfort but also has no connection to the purpose of backwashing.