Poly-Guard® Crystals, Scale & Rust Preventer

Poly-Guard®

Poly-Guard® Crystals, Scale & Rust Preventer

$64.16

SKU: GP10C

Extended-Release Corrosion Control

Specifically formulated to prevent hard water scale and iron staining in commercial, industrial, and residential potable water applications
Forms a protective coating on metal and plastic, preventing scale corrosion and copper leaching in potable plumbing systems, boilers, cooling towers, and geothermal systems
Inject liquid by chemical feed pump into the water system close to the water source
Compatible with most chemical feed pumps

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Long-Lasting Scale and Corrosion Control

Poly-Guard® Scale & Rust Preventer Crystals give contractors a simple, reliable way to help prevent scale, rust, corrosion, and staining in residential, commercial, and light industrial water systems. The controlled-release crystal format helps maintain consistent protection over time without messy liquid handling or constant adjustment.

Protect Systems With Less Maintenance

Hard water, iron, and corrosion can create costly service issues for customers — from stained fixtures and plumbing buildup to premature equipment wear. Poly-Guard Crystals help form a protective coating inside the water system, reducing scale buildup and corrosion while helping contractors deliver cleaner, more reliable water system performance.

WHY CONTRACTORS RELY ON POLY-GUARD CRYSTALS

EXTENDED-RELEASE PROTECTION - Controlled-release crystals help provide steady scale and corrosion control over time with fewer maintenance demands.

HELPS PREVENT SCALE AND RUST STAINS - Reduces mineral buildup and iron-related staining that can affect fixtures, plumbing, appliances, and equipment.

SUPPORTS SYSTEM-WIDE PROTECTION - Helps form a protective barrier on metal and plastic surfaces to reduce corrosion and copper leaching.

CLEAN, CONTROLLED DELIVERY - Cartridge and refill options make installation and maintenance simple, clean, and consistent.

VERSATILE APPLICATIONS - Suitable for a wide range of water treatment applications, including residential plumbing, commercial systems, boilers, cooling towers, and geothermal systems.

SIMPLIFIES SERVICE PROGRAMS - Helps contractors standardize maintenance, reduce callbacks, and provide customers with dependable long-term protection.

Build a More Efficient Service Model

Poly-Guard Crystals make it easier to protect water systems without adding complexity to the job. With long-lasting performance and simple cartridge-based maintenance, contractors can deliver reliable scale and corrosion control while creating predictable service opportunities.

Specify Poly-Guard Crystals for clean, controlled, long-term protection against scale, rust, and corrosion.

Help Protect Your Plumbing From Scale, Rust, and Corrosion

Poly-Guard® Scale & Rust Preventer Crystals help protect your home’s water system from common problems caused by minerals, iron, and corrosion. Used as part of a professionally installed water treatment system, Poly-Guard helps reduce scale buildup, rust staining, and corrosion that can affect plumbing, fixtures, appliances, and equipment.

Long-Lasting Protection Made Simple

Over time, untreated water can leave behind mineral deposits, cause stains, and contribute to wear inside your plumbing system. Poly-Guard Crystals are designed to release protection gradually, helping maintain cleaner, better-protected water lines with less frequent maintenance.

WHY HOMEOWNERS ASK ABOUT POLY-GUARD CRYSTALS

HELPS REDUCE SCALE BUILDUP - Helps prevent mineral deposits that can collect inside plumbing, fixtures, appliances, and water-using equipment.

HELPS PREVENT RUST STAINS - Reduces iron-related staining that can affect sinks, tubs, toilets, fixtures, and other surfaces.

PROTECTS PLUMBING AND EQUIPMENT - Helps form a protective barrier inside the water system to reduce corrosion and support longer equipment life.

LOW-MAINTENANCE PERFORMANCE - Extended-release crystals provide long-lasting protection with simple cartridge or refill maintenance.

PROFESSIONALLY RECOMMENDED - A smart solution your water treatment professional can use to help protect your home’s water system over time.

WORKS THROUGHOUT THE SYSTEM - Helps provide protection across plumbing lines, fixtures, appliances, and connected equipment.

A Simple Way to Help Protect Your Home

Poly-Guard Crystals help reduce the problems you can see — like scale and rust stains — and the problems you may not see inside your plumbing system. Ask your water treatment professional whether Poly-Guard is the right solution for your home’s water conditions.

For best results, work with a qualified water treatment professional to test your water and recommend the right system setup.

INSTRUCTIONS FOR USE (Read Full Product Label Before Using):

Install the Poly-Guard Cartridge in any standard #10 water filter housing.

TO INSTALL CARTRIDGE: Turn off water supply (press pressure relief button or place housing in bypass if present). Unscrew housing, remove old cartridge, remove and clean o-ring. Wash housing with soap solution, rinse thoroughly, add about 1 tablespoon of bleach, and rinse thoroughly a second time. Insert new Poly-Guard Cartridge. Lubricate o-ring with silicone grease, re-seat in housing, screw housing back onto the cap and tighten. Turn on water supply. Check for leaks before leaving installation.

NOTE: Poly-Guard is released through the beads. Empty beads may remain in the cartridge at approximately the same level as a new cartridge.

Product Resources

Scale & Rust Preventer, Crystals

Resource: SDS Sheet English

Resource: SDS Sheet French

SKU Detail

SKU	GP10C	GP63N
Size	1 lb. 8 oz. Cartridge	3 lb. Refill
Item UPC	8-18125-00062-7	8-18125-00060-3
Item Length	2.38 in	5.5 in
Item Width	2.38 in	4 in
Item Height	9.75 in	9.25 in
Item Weight	1.85 lb	3.45 lb
Case Pack	6	6
Case UPC	10018125002622	10818125000600
Case Length	13.5 in	11.5 in
Case Width	9.75 in	10.75 in
Case Height	1075 in	9.75 in
Case Weight	12 lb	21.2 lb
Cases/Pallet	70	36

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Frequently Asked Questions

Pro Products

What are Poly-Guard® Crystals used for?

Poly-Guard® Crystals are a scale- and stain-prevention treatment used to control hardness and iron in water systems without a water softener. They are used when hard water causes scale buildup or iron causes staining on fixtures and appliances.

How do Poly-Guard® Crystals work?

Poly-Guard® Crystals dissolve slowly through a cartridge system, releasing treatment that helps sequester hardness minerals and iron in the water. This helps prevent scale buildup and staining on plumbing and equipment over time.

Can Poly-Guard® Crystals help prevent hard water scale?

Poly-Guard® Crystals treat water with up to 12 GPG (200 PPM) hardness and up to 1 GPG (17 PPM) iron. They are a good fit when scale buildup or moderate iron staining is the primary issue rather than severe contamination.

Do Poly-Guard® Crystals help with iron buildup and staining?

Yes. Poly-Guard® Crystals are formulated to help prevent iron build-up in water systems and can help reduce the staining problems that often come with iron in household water. The product guidance states that Poly-Guard® sequesters up to 1 GPG, or 17 PPM, of iron.

Do you need a water softener to use Poly-Guard® Crystals?

No. Poly-Guard® Crystals are positioned as a safe and economical way to treat hard water and iron without using a water softener. That can make them appealing for homeowners or contractors looking for a simpler scale- and stain-prevention option in certain applications.

How are Poly-Guard® Crystals applied?

Poly-Guard® Crystals are typically administered through the Poly-Guard® Cartridge, which fits standard 10-inch whole-house filter housings. The cartridge provides controlled release of the crystals into the water supply and is designed for simple replacement.

How long do Poly-Guard® Crystals last?

A Poly-Guard® cartridge loaded with crystals can treat up to 30,000 gallons of water and lasts up to 6 months, depending on water use and conditions. The product directions recommend replacing the crystals every 30,000 gallons or every 6 months to maintain effectiveness.

How much water can Poly-Guard® Crystals treat?

One pound of crystals will treat about 20,000 gallons of water. A full cartridge holds 1.5 pounds of crystals and can treat up to 30,000 gallons before replacement is recommended.

What water conditions can Poly-Guard® Crystals handle?

Poly-Guard® sequesters up to 12 GPG, or 200 PPM, of hardness and up to 1 GPG, or 17 PPM, of iron. That makes it a fit for applications where scale and moderate iron-related staining are the primary concerns.

Are Poly-Guard® Crystals safe for potable water systems?

Yes. Poly-Guard® Crystals are certified to meet NSF/ANSI/CAN Standard 60 for drinking water additives. That certification supports their use in potable water treatment applications when they are used as directed.