Refresh 68% Cal Hypo Shock 25lb
Product Overview
At 68% available chlorine, this 25 lb bucket of RE-FRESH calcium hypochlorite is what pool techs reach for when they need a fast-acting, unstabilized shock.
RE-FRESH 68% Cal Hypo Shock is a proven choice for both routine maintenance and problem-solving pool care, providing a high-performance treatment to eliminate bacteria and organic contaminants. This 25 lbs. granular formula dissolves quickly without pre-mixing, making it a reliable solution for restoring water clarity in both in-ground and above-ground pools. Unlike stabilized shocks, this Calcium Hypochlorite treatment allows you to boost chlorine levels without the risk of 'chlorine lock' caused by rising stabilizer levels.
Benefits & What Makes It Different
68% Available Chlorine
This high-concentration Calcium Hypochlorite formula provides the strength needed to kill algae and bacteria quickly without the filler found in lower-grade products.
Unstabilized Formula
Because it contains no cyanuric acid, this 25lb bucket is ideal for pools that already have high stabilizer levels or for those in hot climates where CYA management is critical.
Fast-Dissolving Granules
Designed for direct application, these granules dissolve rapidly to clear cloudy water and handle heavy bather loads without the need for messy pre-dissolving.
Product Details
Calcium Hypochlorite 68%
1 lb per 10,000 gallons for routine shocking
Compatibility
- Do not mix with any other chemicals, including other pool chemicals
- Compatible with vinyl, fiberglass, and plaster surfaces
- Wait until chlorine levels drop below 4.0 ppm before swimming
When To Use This
Pro Tip
In regions with naturally hard water, monitor your calcium hardness levels closely when using Cal Hypo, as each 1 lb dose per 10,000 gallons adds approximately 5-8 ppm of calcium to the water.
Common Questions & Instructions
How much RE-FRESH 68% Cal Hypo should I use for a 10,000-gallon pool?
For routine maintenance, apply 1 lb of this 25 lb bucket per 10,000 gallons of water; for heavy algae or 'green' recovery, you may need to double or triple this dose depending on water conditions.
Does this pool shock add cyanuric acid (CYA) to my water?
No, this product is made of calcium hypochlorite, which is an unstabilized chlorine source, meaning it will not increase your stabilizer levels even with frequent use.
Can I mix this shock with other chlorine tablets or chemicals?
No, you must never mix this product with other chemicals, especially Trichlor or Dichlor tablets, as it can cause a violent chemical reaction, fire, or explosion.
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.
