What are the main components of a swimming pool filtration system?

The main components of a swimming pool filtration system include the pump, filter, and circulation system. The pump is crucial as it circulates water through the pool, ensuring that it flows into the filter for cleaning. The filter plays an essential role in removing debris, dirt, and contaminants from the water, maintaining water clarity and hygiene. The circulation system, which consists of various plumbing and fittings, connects the pump to the filter and returns the purified water back to the pool, creating a continuous flow that helps maintain water quality and balance.

The other options do not accurately represent the core components of a filtration system. While items like the skimmer and drain play roles in overall pool maintenance, they are not the central elements of the filtration process itself. The deck, lighting, and diving boards pertain more to the pool's structure and recreational features rather than its filtration system. Additionally, while water, chemicals, and cleaning tools are important for overall pool management, they do not constitute the filtering mechanism that keeps pool water clean and safe for users.