Pool Breeze Opticide Copper Algaecide 32 fl oz Bottle | 88481

The "Backup" Your Chlorine Needs

If chlorine is the "hero" of your pool, algaecide is the trusty sidekick. While chlorine kills bacteria and most algae on its own, Algaecide is a specialized chemical designed to either prevent algae from taking root or kill stubborn blooms that chlorine can't handle alone.

Algae—whether green, yellow (mustard), or black—has a protective slime layer that makes it difficult to kill. Algaecides work by penetrating this outer shell, effectively "popping" the cell wall so your sanitizer can finish the job.

Why you need it:

• Prevention: A weekly maintenance dose keeps algae spores from turning into a full bloom, especially after rainstorms or pool parties.
• Cure: If your pool is already green, a concentrated "killing dose" works alongside pool shock to clear the water faster.
• Specialty: Some algae (like Black Algae) have deep roots that standard chlorine cannot reach without a heavy-duty metallic algaecide.

Q: If I use Chlorine, why do I need Algaecide?
A: Chlorine is consumed rapidly when fighting organic debris. Algaecide acts as an "insurance policy," staying in the water longer to prevent algae from growing even if your chlorine levels accidentally drop (like after a heavy rain).

Q: Can I swim immediately after adding Algaecide?
A: Usually, yes! Most non-metallic algaecides are safe for swimming about 15-30 minutes after application. However, if you are also "Shocking" the pool (super-chlorinating) at the same time, you must wait until chlorine levels drop back to 5 ppm or lower.

Q: What is the difference between "Preventative" and "Curative" algaecide?
A: It is often the same chemical but in different concentrations. A "Maintenance" dose is small and used weekly to keep water clear. A "Curative" dose is much stronger (often double or triple the amount) and is used only when active algae is visible.

Q: Why is my pool foaming after adding algaecide?
A: You likely used a "Quat" (Quaternary Ammonium) algaecide, which is cheaper but prone to foaming if you have high aeration (like waterfalls or jets). If you want to avoid foam, look for "Polyquat" options in the Buying Matrix below.

Q: Will Algaecide remove the dead algae from my pool?
A: No. Algaecide kills the algae, turning it gray or white. You must then run your filter to catch it, or vacuum the dead debris to "Waste" to physically remove it from the pool.