Sirona® Defend
Product Overview
A proven choice for preventing mineral scale and algae growth using a multi-action polymer shield.
Sirona Defend is what pool techs reach for when they need a phosphate-free preventative that handles both mineral precipitation and algae spores simultaneously. This 32 oz formula utilizes a 6% Poly[oxyethylene (dimethyliminio) ethylene (dimethyliminio) ethylene dichloride] concentration to create a surface-safe barrier that inhibits green, yellow, and black algae. Unlike standard algaecides, it also functions as a sequestrant to prevent scale buildup on salt cells and tile lines without affecting your water's pH or alkalinity.
Benefits & What Makes It Different
Broad-Spectrum Prevention
Effectively inhibits green, yellow, and black algae growth by creating an invisible polymer shield on all pool surfaces.
Scale & Stain Protection
Sequesters minerals to prevent calcium scale and metallic staining, which is essential for protecting salt chlorine generator cells.
System Compatibility
This non-foaming formula is the standard specification for pools running chlorine, bromine, salt, or mineral systems without causing filter clogs.
Product Details
Poly[oxyethylene (dimethyliminio) ethylene (dimethyliminio) ethylene dichloride] 6%
Initial dose: 8-12 oz per 10,000 gallons; Maintenance: 2-4 oz per 10,000 gallons weekly.
Compatibility
- Safe for all pool surfaces including vinyl and fiberglass
- Compatible with chlorine, bromine, and salt systems
- Do not mix directly with other chemicals in the same bucket
When To Use This
Pro Tip
In high-evaporation regions like the Southwest, mineral concentrations rise quickly; using a sequestrant like Defend weekly prevents the 'white line' of scale from etching into your tile or pebble finish.
Common Questions & Instructions
Can I use Sirona Defend in a pool with a salt water chlorinator?
Yes, Sirona Defend is highly recommended for salt systems as it helps prevent calcium scale from forming on the electrolytic plates, extending the life of your salt cell.
How long should I wait to swim after adding Sirona Defend to my pool?
You should wait at least 15 to 30 minutes for the product to fully disperse throughout the water while the pump is running before allowing swimmers back in.
Does Sirona Defend contain copper or add stabilizer to the water?
No, this is a non-metallic, polymer-based formula that does not contain copper and will not increase your cyanuric acid (CYA) levels, making it safe for frequent use.
Delivered today to your DFW neighborhood
Order this item by 2 PM Central on a weekday, and we'll have it on your driveway by evening. Same-day delivery is FREE to every ZIP in our DFW coverage area — no minimum — or it's free with our weekly service plan.
