Hayward Paramount Ultra UV2 004422202100 1 Lamp Water Sanitizer 120V. Water circulates through the Ultra UV2 chamber and the UV-C lamp immediately inactivates 99.9% of micro-organisms such as crypto, giardia and algae which are resistant to chlorine. This provides a cleaner, clearer swimming environment with zero harmful by-products. Plus, dramatically reduce the amount of chlorine needed to maintain an adequate level of residual sanitizer. Paramount’s eco-friendly, Ultra UV2 – Ultraviolet pool system for clean, healthy water in new or existing pools.