Product Benefits
How to Use
How to Use
This product is a fast-dissolving, stabilized chlorine designed to sanitize spa and hot tub water, control bacteria and algae, and keep water clear with no visible residue.
Before use, test spa water and ensure pH, total alkalinity, and hardness are within recommended ranges. Keep the circulation system running while adding this product.
How to Use
This product is a fast-dissolving, stabilized chlorine designed to sanitize spa and hot tub water, control bacteria and algae, and keep water clear with no visible residue.
Before use, test spa water and ensure pH, total alkalinity, and hardness are within recommended ranges. Keep the circulation system running while adding this product.
Routine Chlorination
For regular spa sanitation, scatter 0.4–0.6 ounces of this product per 500 gallons of water over the spa surface.
Test free available chlorine and add additional product as needed to maintain 3–5 ppm while the spa is in use.
Shock Treatment
After heavy spa use or when water quality declines, shock treat with 1.2 ounces of this product per 500 gallons of water.
This provides approximately 10 ppm available chlorine.
Do not enter the spa until free available chlorine levels return to 3–5 ppm.
Ingredients
Ingredients
Active Ingredient:
Sodium Dichloro-s-Triazinetrione dihydrate: 99%
Other Ingredients: 1%
Total: 100%
Safety, Storage, and Disposal
Safety, Storage & Label Guidance
Use this product only as directed. Avoid contact with eyes and skin and avoid breathing dust.
Wear protective eyewear and wash hands thoroughly after handling.
Do not mix with other chemicals or pre-dissolve before use.
Store in a cool, dry, well-ventilated area away from heat or open flame.
For complete safety precautions, first aid instructions, and disposal information, always refer to the product label.
Reviews
Block Chlorine Lock with Cal Hypo
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Simplified Pool and Spa Care with HTH™ Test to Swim
Simplify pool and spa water testing with the HTH™ Test to Swim™ App. Scan your test strip, get instant results, and receive personalized pool care recommendations.
Transform Your Pool with Brilliance™
Looking for clearer pool water? Discover how HTH™ Brilliance Cal Hypo Chlorine Tablets improve water clarity and prevent chlorine lock.
Quick Spa Tips

Always read product label directions and use only as directed

Always add chemicals to spa water, never the other way around

Never add chemicals to spa water when people are in the spa

Never mix products together

Always store spa products in a cool, dry location and away from direct sunlight

Always wear proper safety equipment when handling chemicals



