Dy-Chlor II Sanitizer 4lb Pail
Product Overview
A proven choice for rapid superchlorination without the cloudiness or calcium buildup associated with traditional shock treatments.
Regal Dy-Chlor II is a 99.0% Sodium Dichlor granular sanitizer that provides 56% available chlorine for immediate water restoration. This 4lb pail is what pool techs reach for when they need a fast-dissolving, pH-neutral shock that won't cloud the water or increase calcium hardness levels. Unlike generic shocks, this stabilized formula includes cyanuric acid to protect your chlorine residual from UV degradation.
Benefits & What Makes It Different
99.0% Sodium Dichlor Formula
Contains 56% available chlorine in a 4 LBS container, offering a concentrated solution for both daily sanitizing and heavy-duty superchlorination.
Fast-Dissolving Granules
The totally soluble nature of Dy-Chlor II means it leaves no residue on the pool floor, making it safe for vinyl liners and fiberglass surfaces.
Stabilized for UV Protection
Because this product includes built-in stabilizer (CYA), it reliably handles the intense sun exposure that typically burns off unstabilized chlorine in hours.
Product Details
Sodium dichloro-s-triazinetrione dihydrate 99.0%
1 lb per 10,000 gallons for superchlorination; 1-3 oz per 10,000 gallons for daily maintenance.
Compatibility
- Do not mix with other chemicals, especially other types of chlorine
- Safe for all pool surfaces including vinyl, plaster, and fiberglass
- Wait for chlorine levels to reach 1-4 ppm before swimming
When To Use This
Pro Tip
In hot climates where chlorine burns off quickly, Dichlor is excellent for building a base, but keep an eye on your Cyanuric Acid levels; if CYA exceeds 50-70 ppm, switch to an unstabilized chlorine to avoid 'chlorine lock'.
Common Questions & Instructions
How much Dy-Chlor II do I need to shock a 10,000-gallon pool?
To superchlorinate and restore water clarity, use 1 lb of Dy-Chlor II per 10,000 gallons of pool water. For routine maintenance, a dose of 1 to 3 oz per 10,000 gallons daily is usually sufficient to maintain a 1-3 ppm chlorine residual.
Will this product increase the calcium hardness or pH of my pool?
No, Sodium Dichlor is nearly pH-neutral and does not contain calcium. This makes it the standard specification for homeowners in hard water areas who want to avoid scaling and cloudy water issues.
How long should I wait to swim after adding this 4lb pail of shock?
After adding a shock dose, you should wait until the free chlorine levels have dropped back down to the 1-4 ppm range. This typically takes 8 to 12 hours depending on the bather load and sunlight exposure.
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.
