Refresh 68% Cal Hypo Shock 25lb
Product Overview
The standard specification for rapid, stabilizer-free pool sanitization.
RE-FRESH Dry Chlorinating Granular is a proven choice for pool operators needing a fast-acting 68% Calcium Hypochlorite treatment. This 25 lb (also labeled as 25lb or 25 lbs.) bucket of calcium hypochlorite delivers powerful sanitization to destroy organic contaminants, bacteria, and algae without adding cyanuric acid (CYA) to your water. It serves as a reliable solution for both routine maintenance and problem-solving pool care, keeping your pool safe and crystal clear.
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Benefits & What Makes It Different
68% Available Chlorine
Formulated with 68% active Calcium Hypochlorite to quickly raise free chlorine levels to the ideal free chlorine 1–3 ppm range, destroying organic waste and algae.
Zero Cyanuric Acid (CYA)
Unlike dichlor or trichlor shocks, this cal hypo formula will not raise stabilizer levels, helping you avoid lockouts in pools already at the cyanuric acid 30–50 ppm limit.
Fast-Dissolving Granules
The 25 lbs. dry chlorinating granular formula dissolves rapidly in water, making it a reliable solution for both routine maintenance and problem-solving pool care.
Product Details
Calcium Hypochlorite 68%
9 to 18 oz per 10,000 gallons for routine superchlorination
Compatibility
- Compatible with plaster, vinyl, and fiberglass pools
- Do not mix with any other chemicals, including other pool chlorinating products
- Wait until free chlorine levels drop to 1–3 ppm before swimming
When To Use This
Pro Tip
In hot climates where sunlight burns off chlorine rapidly, always apply this cal hypo shock in the evening with the pump running. This allows the chlorine to work overnight without UV degradation, and ensures any undissolved granules are brushed off the floor to prevent liner bleaching.
Common Questions & Instructions
How much Refresh pool shock do I need to add per 10,000 gallons?
For routine superchlorination, add 9 to 18 ounces of this 68% calcium hypochlorite shock per 10,000 gallons of water to maintain free chlorine 1–3 ppm. Always add product to large quantities of water to fully dissolve product before pouring, or broadcast it directly into the deep end with the pump running.
Will this 25 lb Refresh shock raise my pool's calcium hardness?
Yes, because the active ingredient is Calcium Hypochlorite, it will gradually increase calcium hardness. If your pool water is already near or above the ideal calcium hardness 200–400 ppm range, monitor your levels closely, especially in hard water regions like the Southwest.
Can I use this Refresh shock in a saltwater pool?
Yes, for saltwater pools running a chlorine generator where salt 2700–3400 ppm is maintained, this cal hypo shock is an excellent way to boost chlorine without raising stabilizer. Ensure your pH 7.2–7.6 and total alkalinity 80–120 ppm are balanced before application.
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.
