Hayward W3DE3620 Pro-Grid DE Pool Filter 36 sq.ft.

No, typically you don't need to drain the pool to replace an underwater light. Most LED fixtures allow for bulb replacement while submerged, but ensure the power is off before proceeding.

Yes, saltwater pools require pumps that are compatible with saltwater systems. Look for pumps made from corrosion-resistant materials to ensure longevity and efficiency in saltwater environments.

Yes, Shasta Pure can be added to existing pools. However, the current equipment setup and water quality need to be assessed to ensure ideal installation and results. Shasta Pure is designed to replace traditional chlorine, salt chlorine generating systems, or other sanitation systems.