HTH™ Pool Care Chlorine Granules Ultra: Granular Chlorine
HTH™ Chlorine Granules Ultra delivers powerful sanitation and clarity in one simple step.
- These fast-dissolving pool chlorine granules use a Cal-hypo formula that won’t add extra cyanuric acid (CYA), helping prevent overstabilization, cloudy water, and chlorine lock.
- The all-in-one action kills bacteria and algae, clarifies and softens water, and helps prevent stain and scale—so your pool looks blue, bright, and inviting.
- Safe for all pool types, including vinyl-lined and saltwater systems, this granular chlorine keeps maintenance easy and reliable.
All-In-One Convenience
One dose sanitizes, clarifies, softens, and helps prevent stain and scale for effortless pool care.
Brilliant Clarity in 24 Hours—
See brilliantly clear, blue water within 24 hours with powerful, fast-acting granular chlorine performance.
Algae & Bacteria Control
Kills algae and bacteria to keep pool water clean, healthy, and consistently swim-ready.
No CYA Buildup
Pool chlorine granules sanitize without adding CYA, helping avoid overstabilization and chlorine lock.
How to use
HTH™ Chlorine Granules Ultra: Granular Chlorine
1. Measure Correct Dosage
Follow the on-pack instructions according to the size of your pool. Make sure to use a clean, dry scoop.
Follow the on-pack instructions according to the size of your pool. Make sure to use a clean, dry scoop.
2. Apply Directly To Pool Water
While the filter pump is running during the evening, apply chlorine granules evenly over a wide area in the deepest part of the pool. Use a brush to disperse any granules that fall to the bottom of the pool.
While the filter pump is running during the evening, apply chlorine granules evenly over a wide area in the deepest part of the pool. Use a brush to disperse any granules that fall to the bottom of the pool.
3. Test Free Available Chlorine (FAC)
After granules have dissolved completely, use HTH™ 6-Way Test Strips to test FAC. Do not enter your pool until the free available chlorine residual is 1 to 4 ppm (parts per million).
After granules have dissolved completely, use HTH™ 6-Way Test Strips to test FAC. Do not enter your pool until the free available chlorine residual is 1 to 4 ppm (parts per million).