Why did SteriPEN treat my water for only 38 seconds (not the normal 48 second dose)?
In some SteriPEN models, when you treat a new sample of water within 2 minutes of the previous treatment, the purification time is reduced by 10 seconds to 38 seconds. This is because when the lamp is warm the UV output starts out higher than it does if the lamp is cold, allowing the lamp to deliver the required total UV dose faster that a cold lamp. This is only true for the second 0.5 liter dose – the 90 second dose for 1 liter is always 90 seconds. In some SteriPEN models, when you treat a new sample of water within 2 minutes of the previous treatment, the purification time is reduced by 10 seconds to 38 seconds. This is because when the lamp is warm the UV output starts out higher than it does if the lamp is cold, allowing the lamp to deliver the required total UV dose faster that a cold lamp. This is only true for the second 0.5 liter dose – the 90 second dose for 1 liter is always 90 seconds.
