Product Overview

The Pentair BioShield 522638 is a 150W high-output ultraviolet (UV) water treatment system with a built-in flow switch, rated for 120/240V service and flow up to 100 GPM. Installed in the return plumbing, it exposes water to UV light as it passes through the chamber, neutralizing bacteria and waterborne pathogens such as Cryptosporidium, Giardia and E. coli in seconds. It works alongside your chlorine or salt chlorinator, helping reduce chloramines, chlorine odor and overall chlorine demand.

⚠️ Important Purchase Notice

This UV system must be plumbed and wired by a qualified pool professional or licensed electrician in line with local codes and Pentair's installation instructions. A UV system supplements your sanitizer; it does not replace it. Please inspect your shipment on arrival and report any shipping damage promptly.

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Ideal For

• Residential pools and spas with flow rates up to 100 GPM
• Pools with heavy bather loads
• Owners who want to reduce chloramines, chlorine odor and eye and skin irritation
• Pools using chlorine or salt chlorination that want a secondary sanitation layer

Key Features

• 150W low-pressure, high-output UV lamp
• Built-in flow switch
• 120/240V electrical configuration
• Maximum flow rate of 100 GPM
• NSF listed
• Energy-efficient lamp rated for up to 12,000 hours of operation
• UV-resistant high-density polymer housing

Benefits

• Neutralizes harmful bacteria and pathogens quickly as water passes the lamp
• Can cut chlorine usage by up to half, according to Pentair
• Helps reduce itchy skin, red or burning eyes and chemical odors
• Low operating cost and simple maintenance

Compatibility

The BioShield 522638 is sized for systems with flow up to 100 GPM and runs on 120V or 240V service. It works alongside chlorine or salt chlorination. Before ordering, confirm your system's flow rate, plumbing size and electrical service, and confirm the part number 522638 matches your needs.

Installation or Upgrade Context

The BioShield is installed in the return line after the filter (and heater, where present) so that filtered water passes through the UV chamber before returning to the pool. It is a straightforward addition for new pools and a common upgrade for existing pools where owners want lower chlorine demand and fewer chloramine complaints. The built-in flow switch helps ensure the lamp runs only when water is flowing.

What’s Included

• Pentair BioShield 150W UV system with flow switch (522638)

Specifications

Warranty

This product is covered by Pentair's manufacturer warranty, subject to Pentair's terms and conditions, including professional installation where required. Pool Supply Depot can provide proof of purchase for warranty claims.

Customer Q&A

Does UV replace chlorine?

No. The BioShield works alongside chlorine or salt chlorination. It can substantially reduce the amount of chlorine needed, but a residual sanitizer is still required.

What is the maximum flow rate?

Up to 100 gallons per minute.

What voltage does it require?

It is rated for 120/240V service.

Does it have a flow switch?

Yes, this model includes a flow switch.

How long does the UV lamp last?

The high-output lamp is rated for up to 12,000 hours of operation.

How much does it weigh?

Approximately 42 lbs shipping weight.