C3 3in Chlorine Tablets 10 lb - Long Lasting Pool Sanitizer

In this review the C3 3in Chlorine Tablets earn a solid recommendation for pool and spa owners who want a low-effort way to maintain clean water. The biggest reason to buy is the combination of slow-dissolving, individually wrapped tablets and built-in UV protection, which means one tablet treats up to 10,000 gallons and can help keep chlorine levels steady for about a week. For anyone managing a residential pool or hot tub, these tablets simplify dosing and reduce the need for daily treatment.

Key Features

• High concentration: Made from 99% Trichloro-S-Triazinetrione with about 90% available chlorine, the formula delivers potent sanitizing power per tablet.
• Slow dissolving: The 3in tablets dissolve gradually so you can dose once weekly instead of frequently adding chlorine.
• Cyanuric acid stabilized: Built-in cyanuric acid helps protect available chlorine from sunlight, extending effectiveness outdoors.
• Individually wrapped: Each tablet is wrapped for easier handling and cleaner storage when using floaters or feeders.
• Wide compatibility: Safe for use in pools, spas, and hot tubs and suitable for chlorinators and chemical floaters.

Who It's For

These tablets are best for homeowners and caretakers with aboveground and inground pools who prefer a set-and-forget weekly dosing routine. The product suits those who use floaters or inline chlorinators and want a tablet that dissolves predictably and protects chlorine from UV degradation.

Serious competitive pools or those needing very tight daily chemical control may want a different regimen or supplemental non-stabilized chlorine products, since these tablets include cyanuric acid which raises CYA levels over time.

Pros & Cons

Pros

• Consistent tablet size and a steady dissolve rate make weekly dosing reliable.
• Individually wrapped tablets are convenient and reduce mess when loading feeders.
• Customers report excellent water clarity and stable chlorine levels with regular use.
• Strong concentration means effective sanitation with fewer tablets.

Cons

• Contains cyanuric acid, so pools will accrue stabilizer over time and may need periodic CYA management.
• Not ideal when very rapid chlorine spikes are needed for immediate shock treatment.

Specifications

Product form	3in slow-dissolving tablets
Net weight	10 lb bag
Active compound	Trichloro-S-Triazinetrione (99%)
Available chlorine	About 90%
Stabilizer included	Cyanuric acid (CYA)
Coverage per tablet	Treats up to 10,000 gallons
Packaging	Individually wrapped tablets

Our Verdict

The C3 3in Chlorine Tablets are a practical choice for most residential pool owners who want dependable weekly sanitation with minimal fuss. Their high concentration, slow dissolve rate, and included stabilizer deliver lasting chlorine protection and clear water, making them good value for routine maintenance while requiring occasional CYA monitoring.

Frequently Asked Questions

How often should I test chlorine when using these tablets?
Test chlorine and basic water balance at least once per week and adjust if levels drift.

Can these tablets be used in a spa or hot tub?
They are safe for spas and hot tubs, but due to high concentration use appropriate dosing and follow manufacturer guidance for small volumes.

Do these tablets protect chlorine from sunlight?
Yes, the tablets contain cyanuric acid which stabilizes chlorine and helps reduce UV degradation.