BioGuard Stabilizer 100 Cyanuric Acid Pool Stabilizer, 5 lb — Granular UV Chlorine Protector

BioGuard Stabilizer 100 is a granular cyanuric acid pool additive that slows sunlight-driven chlorine loss so outdoor pools retain sanitizer longer.

When sunlight hits a chlorinated outdoor pool, free chlorine degrades rapidly and you end up adding more product more often. BioGuard Stabilizer 100 delivers a soluble cyanuric acid formula designed to reduce that breakdown, lowering chlorine consumption and smoothing weekly maintenance. Packaged in a convenient 5-pound container for residential pools, this product is intended specifically for outdoor, chlorinated systems where UV exposure is the primary cause of chlorine depletion.

How does it help keep chlorine effective in outdoor pools?

By adding cyanuric acid to the water, Stabilizer 100 forms a protective interaction with free chlorine, reducing the rate at which ultraviolet light from the sun neutralizes the sanitizer. This preserves a useful free chlorine residual so treatments last longer between additions. It does not replace chlorine; it helps the chlorine already in the water remain available to sanitize for extended periods.

• Contains cyanuric acid in a fully soluble granular form for even distribution.
• Reduces UV-driven chlorine loss, lowering weekly chlorine consumption.
• Applied slowly through the skimmer for safe, uniform dissolution.

How do I add BioGuard Stabilizer 100 to my pool safely?

The granular formula is designed to dissolve completely when fed slowly into the skimmer while the pump runs. Add the product in small increments over time rather than dumping it all at once to avoid local high concentrations. Always test cyanuric acid and free chlorine levels after application and adjust as needed to reach recommended ranges for your pool type.

• Feed slowly through the skimmer with the pump circulating for even mixing.
• Measure cyanuric acid levels after treatment to avoid excessive concentrations.
• Follow label directions; intended for outdoor, chlorinated pools only.

Will Stabilizer 100 affect my pool’s chemical balance or filtration?

Used as directed, the product adds only cyanuric acid and does not directly change pH, alkalinity, or hardness, though those parameters should still be monitored as part of routine maintenance. It dissolves completely and passes through standard filtration without leaving residues. Maintaining proper overall water balance ensures the stabilizer performs optimally alongside chlorine and other treatment chemicals.

• No insoluble residues when fed correctly; compatible with typical pool filters.
• Does not substitute for routine pH or alkalinity adjustments.
• Regular testing keeps cyanuric acid within effective, manufacturer-recommended ranges.

How much of the 5 lb pack will I need and how often should I reapply?

Required amounts depend on pool volume and existing cyanuric acid concentration. A 5-pound container is sized for multiple treatments in smaller residential pools or a single top-up for larger ones. Reapplication frequency depends on dilution from backwashing, splash-out, and added fresh water, so monitor levels periodically and add only as needed to maintain the target stabilizer concentration.

• Coverage varies by pool size—test water to calculate exact dosage.
• One 5 lb container typically treats or supplements a residential pool across several adjustments.
• Reapply when measured cyanuric acid falls below the target range for your pool.

Who is this for: BioGuard Stabilizer 100 is aimed at owners and service professionals responsible for outdoor, chlorinated pools who want to reduce chlorine usage and stabilize sanitizer performance under sunlight. It’s suitable for residential and light-commercial pools that already use chlorine-based sanitation and need a soluble cyanuric acid product for UV protection. If you maintain a covered, indoor, or non-chlorine-treated pool, this product is not intended for those environments.