Sterilight SQ-PA Ultraviolet (UV) Sterilizer

This product has been discontinued by the manufacturer. Comparable units include: Viqua (Trojan) UVMax Model A and Sterilight Copper Series.

The Sterilight SQ-PA Ultraviolet (UV) water sterilizer is a popular and economical choice for point-of-use applications with flow rates up to a maximum of 1.5 gallons per minute (GPM) or 5.7 liters per minute (LPM). It is a very popular choice as post treatment after a residential under-sink reverse osmosis system or other under sink water filter, or for treating water at a single faucet, water fountain, or similar low flow rate application. The SQ-PA is incorporated into our very popular ClearChoice 5-stage reverse osmosis system with UV.

The Sterilight SQ-PA (part of Sterilights's Silver Series) includes many popular convenience features including a visual "lamp on" indicator light, audible lamp failure alarm, and LED display that indicates lamp life remaining and total controller run time. The SQ-PA also features a stainless steel reactor chamber, a fire-polished domed quartz sleeve, and Sterilights' popular Sterilume™-EX coated low pressure germicidal UV lamp which can be easily changed without interrupting the water flow. It also incorporates Sterilight's Silver controller which automatically senses line voltage between 100 and 240 volts for consistent UV output and performance in varying electrical operating conditions.

Pre-treatment Requirements:

All UV sterilizers required sediment pre-filtration to reduce or eliminate the possibility that a targeted contaminant could "hide" behind a sediment particle in the "shadow" of the UV light and therefore not receive a full dose of UV light. Accordingly, the manufacturer strongly recommends sediment pre-filtration down to a level of 5 microns or smaller.

Water exceeding 120 ppm in hardness (7 grains per gallon) should be softened to reduce the risk that hard water mineral scale will build-up on the UV sleeve thereby reducing UV light distribution into the UV chamber. Similarly, iron levels exceeding 0.3 ppm or manganese levels exceeding 0.05 ppm should also be treated to prevent staining of the UV sleeve.

Elevated levels of certain other contaminants, such as tannins, can cause a reduction in UV transmittance (the ability of the water to transmit UV light). If the UV transmittance (UVT) of your water is less than 75% after the above-mentioned pre-treatment, activated carbon filtration may be desirable to improve UV transmittance. The majority of deep wells have a UVT of 85% or greater. If your UVT is unknown, select a model with a higher flow rate capacity then you feel you will really require (this will provide a higher UV dose at your desired flow rate), or add an activated carbon pre-filter to your system. We recommend the following pre-filter equipment:

Sterilight SQ-PA Specifications
Applications point-of-use
Max. Flow Rate
(UV dose >30 mJ/cm2)*
1.5 GPM (5.7 LPG)
Max. Flow Rate
(UV dose >40 mJ/cm2)*
1.0 GPM (3.8 LPM)
Water Chamber Material 304 Stainless Steel
Chamber Length 12.0 inches / 30.5 cm
Chamber Diameter 2.0 inches / 5.2 cm
Controller Size 7.3 x 3.2 x 2.5 inches
(19.0 x 8.1 x 6.4 cm)
Lamp Sterilume-EX
Model S212RL
Sleeve Quartz
Model QS-212
Electrical 100-240v, 50/60HZ
Power Consumption 15 watts
Lamp Power 10 watts
Inlet / Outlet Plumbing Ports 1/4" MNPT
"Power-On" Indicator Light
Audible Lamp Failure Alarm
Lamp Replacement Reminder
LED Display: Lamp Life Remaining, Total Controller Runtime
Warranty Reaction Chamber: 7 years
Lamp: 1 year
All Other components:2 years
Feed Water Quality Parameters
Iron 0.3 ppm
(0.3 mg/L)
Manganese 0.05 ppm
(0.05 mg/L)
Tannins 0.1 ppm
(0.1 mg/L)
Turbidity < 1 NTU
Hardness < 120 ppm
(7 grains / gallon)
UV Transmittance (UVT): > 75%
Maximum Temperature: 104F (40C)
Maximum Pressure: 125 psi

Options, Accessories and Replacement Parts

Sterilight S212RL Lamp

Sterilight S212RL Lamp

MSRP: US$76.00
Our Price: US$55.00
You save: $21


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Sterilight QS-212 Sleeve

Sterilight QS-212 Sleeve

MSRP: US$36.00
Our Price: US$27.00
You save: $9


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*Note: Maximum recommended flow rates based on 95% UV transmittance. Actual dosage depends on flow rate, water quality, and maintenance (cleaning ov UV sleeve). UV dosage will be lower when the UV transmittance capacity of the water drops below 95% - if in doubt, select a model rated for a higher flow rate than you actually require. We recommend a UV dose of not less than 30 mJ/cm2.