Utilizing the UV lamp's length
How the UV lamp is positioned inside the UV Sterilizer is an important design factor and determines how efficient the UV lamp is being used. Placing the UV lamp between the inlet / outlet ports maximizes the lamp's arc length utilization (maximum exposure).

Exposure Chamber Diameter
The diameter of the UV exposure chamber is also a critical design factor and must correspond with the UV lamp's UV Output performance. Once produced inside the UV lamp the UV radiation travels through the lamp's glass envelope, through the protective quartz sleeve and into the UV exposure chamber. As the UV radiation travels through the glass then through the water it becomes weaker. Too small of a UV exposure chamber diameter may waste valuable UV radiation. If the UV body diameter is too large waterborne microorganisms may travel too far from the UV lamp, outside of the area where the lamp is effective.

Reflection
Many UV manufacturers claim substantial increases in UV performance due to using reflective material inside the UV exposure chamber. This claim is false. As previously explained above, the farther UV radiation travels away from the lamp the weaker it becomes. Matching the diameter of the UV exposure chamber to the UV Output performance of the UV lamp, again, is proven engineering.