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SteriPEN® technology is patented in the USA with further 

U.S. patents pending and patents pending worldwide. 

SteriPEN® is a registered trademark of Hydro-Photon, Inc. 

U.S. Patent Numbers 5,900,212; 6,110,424; 6,579,495; 

and 8,362,432.

Conforms to UL Std 61010-1 

Certified to CSA Std C22.2 No. 61010-1

Water Quality Association: SteriPEN® tested 

and Gold Seal certified by 

WQA against U.S. EPA Microbiological Water 

Purifier Standard.

 

Get in touch! We are always happy to hear from you:

visit 

www.steripen.com

, email 

[email protected] 

or call 

1-888-826-6234 

(207-374-4506).

Why am I getting a blinking red LED 

and no light from the UV lamp?

Check your batteries. SteriPEN® products 

are high-powered devices that require good, 

strong batteries to run the UV lamp.

It looks like the tip of Classic 3’s lamp 

is melting — is this normal?

What you are seeing is a small bead of silicone 

used as a shock absorber to protect the lamp.

What happens when I’ve used 

Classic 3 8,000 times?

Classic 3’s LED indicator will flash red 

three times then green once to indicate that 

its bulb is exhausted. Contact us to have it replaced. 

Classic 3’s bulb is shining a purple, 

rather than blue light — is it still working? 

Yes. The visible light indicates that the 

bulb is working regardless of its color.

Can I take Classic 3 on a plane? 

Yes. Classic 3 and all SteriPEN® products are 

allowed in carry-on bags, as well as checked luggage.

Does altitude affect Classic 3’s 

ability to purify water? 

No. SteriPEN® products have been tested and used on 

Mount Everest for years. Cold temperatures, however, 

can affect battery performance, so keep warm them 

before use.

Can I use Classic 3 to treat more 

than 1 liter at a time? 

No, we do not recommend it. Classic 3’s effectiveness is 

ONLY tested and certified for volumes up to 1 liter.

What about parasites like worms and their eggs? 

Does Classic 3 treat for them? 

Due to animal testing restrictions, Classic 3’s 

effectiveness against such parasites 

has not been certified. 

Can Classic 3 treat soda? Iced tea? Juice?

No. UV light will not effectively destroy microbes 

in beverages other than water.

For best results, wet filter cartridge before filling to improve 

water flow. Rub the mesh with a clean cloth until it becomes 

thoroughly saturated.

Remove Pre-Filter before drinking. 

Air vent is not intended for use as a mouthpiece.

SteriPEN does not treat water droplets on the Pre-Filter’s 

body or threads. Be sure to wipe dry any wet surfaces 

before drinking.

Classic 3 is intended for use, and is most effective in clear 

water but can also be used to treat turbid, murky or cloudy 

water in an emergency. By doubling treatment time (treating 

the volume of water twice), Classic 3 can treat water that might 

be described as: “much closer to clear than opaque,” 

“obviously not clear,” “obviously cloudy,” “objects viewed 

through the water are visible but slightly blurry,” or “as cloudy 

as weak lemonade.” For best UV purification results, if the 

water is less clear, filter it first with the SteriPEN® PreFilter, 

FitsAll Filter® or other method.

Classic 3 is not designed to treat volumes of water larger 

than one liter. If more than one liter needs treatment, the 

water should be divided into ½ liter and one liter volumes 

and treated separately.  

When operating properly, the UV lamp will emit visible light 

as well as UV light. If the lamp is not emitting visible light, 

it is not functioning properly and should not be used until 

it has been repaired.

Agitation of water by stirring Classic 3 or rocking the 

container is necessary, as it promotes uniform purification.

Classic 3 is not intended to purify water above the 

surface of the water in the container, such as droplets 

on the sides of the container.

Classic 3 is not intended to purify surfaces of a drinking 

container, like the mouth of the bottle. Be certain that 

you always wipe the bottle’s mouth dry with a clean, 

dry cloth before drinking.

Classic 3 may be used in glass, plastic, ceramic, or metal 

containers, as they all absorb or reflect UV light, thereby 

shielding the user from UV exposure.

Classic 3 is not intended for use by children.

Classic 3 is a high voltage device. Removal or tampering with 

the electronic circuit board or lamp assembly may cause injury, 

or damage. Do not open, expose, modify, or touch internal 

circuitry; doing so can lead to high voltage shock.

As with other fluorescent-type lamps, Classic 3 contains 

a small amount of mercury. At the end of its life, please 

dispose of Classic 3 properly. For specific instructions 

contact your local waste disposal organization.

Classic 3 is not intended to treat liquids other than water. Do 

not use in water with ice. Do not use in water above 

120°F/49°C.

As with any other water treatment system, always have 

a backup method.

While carefully controlled microbiological testing of all 

SteriPEN products has been conducted, use of all SteriPEN 

products in the field may produce results that vary from our 

laboratory test data.

TIPS FOR SAFE USE

USING THE PRE-FILTER

FREQUENTLY ASKED QUESTIONS

PATENTED & CERTIFIED

Directions for Use 40 C.F.R. §156.10(i)(2)(II)
It is a violation of Federal law to use this product in a manner 
inconsistent with its labeling.
SteriPEN

® 

exceeds U.S. EPA Guide Standard and Protocol for Testing 

Microbiological Water Purifiers, destroying over 99.9999% of 
bacteria, 99.99% of viruses, and 99.9% of protozoa when used as 
directed. SteriPEN

® 

is not a sterilizer.

3-year warranty for any manufacturing defect. For product 
registration and complete warranty information, please visit 
www.steripen.com/warranty or contact your local distributor.
While carefully controlled microbiological testing of Classic 3 has 
been conducted, use in the field may produce results that vary from 
our laboratory test data..
CAN ICES-3(B)/NMB-3(B)

NOTE: This equipment has been tested and found to comply with 
the limits for a Class B digital device, pursuant to Part 15 of the FCC 
Rules. These limits are designed to provide reasonable protection 
against harmful interference in a residential installation. This 
equipment generates, uses and can radiate radio frequency energy 
and, if not installed and used in accordance with the instructions, 
may cause harmful interference to radio communications. However, 
there is no guarantee that interference will not occur in a particular 
installation.
 
If this equipment does cause harmful interference to radio or 
television reception, which can be determined by turning the 
equipment off and on, the user is encouraged to try to correct the 
interference by one 
or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit  

 

   different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Warning: Changes or modifications to this unit not expressly 
approved by the party responsible for compliance could void the 
user authority to operate the equipment under FCC rules.

THE FINE PRINT

1  Screw Pre-Filter onto bottle
Insert cartridge and pull blue 
air vent open.

2  Filter water
Pour through or submerge 
bottle until filled.

3  Remove cartridge and purify
Activate SteriPEN, then insert 
into Pre-Filter and invert bottle.

 

PRE-FILTER’S ANATOMY

3

1

2

4

1  

Air vent (not for drinking)

2  

Filter cartridge

3  

Pre-Filter base

4  

Bottle gasket 

Specifications

Nominal filter size: 40 microns

Weight: 45g

47.5 x 67.9mm diameter

Pre-Filter removes large particles, such as 

leaves, twigs, sand and other debris for improved 

UV purification effectiveness. The Pre-Filter is 

not intended to be a purification method. 

To store Pre-Filter, insert filter cartridge with air vent 

pointing down and rotate clockwise to lock in place.

Fits most wide-mouthed bottles, like Nalgene®.

If the equipment is used in a manner not specified 

by the manufacturer, the protection provided by the 

equipment may be impaired.

Do not attempt to bypass water sensor; 

it is an important safety feature.

Do not handle SteriPEN with wet hands; 

do not touch water sensor pins with wet fingers.

 

This device emits UV light, direct exposure 

 may be harmful.

 Do not use UV lamp as a light source.

 Do not use near skin, eyes, or insert into bodily orifices.

CAUTION

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