- Poolweb
- Essential Chemicals
- Chlorine
- Poolweb #CM1925-25
Shock 68% Calcium Hypochlorite Granular - 25 Lbs.
Shipping Options
This item ships free via freight truck. This means that the item cannot ship via regular transportation because it is too large, heavy or needs to be palletized. Learn more about receiving an LTL shipment.
Shopper Protection
- This item is backed by a 30 day Return Policy
Product Information
Additional Resources
- MSDS/SDS (pdf)
Description
This Calcium Hypochlorite is 68% available chlorine and is quick dissolving. It is a routine sanitizer that kills and prevents the growth of algae, bacteria and other microorganisms. Widely used as a shock treatment to destroy organic contamination in pool water, thereby improving the water clarity.
Strong calcium hypochlorite solutions serve as disinfectants for cleaning pool sides and bottoms, decks, diving boards, ladders, floats, locker and shower room floors and benches, sinks and toilets. Restores crystal clarity to pool water.
It is recommended to shock your pool more frequently after heavy rain, hot weather, and when bather load increases heavily.
Note: Also referred to as pink or red slime, this bacteria is brushed away and quickly returns where it collects around ladders, skimmers, lights, pool walls at the water line, steps and plastic surfaces. Brush areas thoroughly to remove slime, and apply.
This is a generic brand and the manufacturer could vary.
Product Features
- Calcium Hypochlorite: 68% available chlorine
- Restores crystal clarity to pool water
- Quick dissolving and routine sanitizer
- Dosage: 1 lb. raises 80,000 gallons of water 1 ppm
- Use to shock the water weekly.
Technical Specifications
| Product Category | Chlorine |
| Poolweb Item # | CM1925-25 |
| Cross Reference # | CM1925 |
| Manufacturer | Poolweb.com |
| Shipping Weight | 28.0 lb |
Troubleshoot Your Water
Cloudy Water
Green Water
Brown Water
Eye Irritation
Chlorine Odor
Calcium Scale
Metal Corrosion
Cloudy Water
Green Water
Brown Water
Eye Irritation
Chlorine Odor
Calcium Scale
Metal CorrosionCloudy Water
| Cloudy Water Causes | Solution | Preventive Measures |
| High pH | Bring your pH into the desired range of 7.4 - 7.6 ppm. | Maintain a proper pH level by using Haviland pH Reducer. |
| Dirty Filter | Check filtration system. Backwash if necessary. | Use Haviland Liquid Filter Cleaner each spring and fall. |
| Low Free Chlorine Residual | Bring free chlorine into desired range of 1 - 3 ppm. Shock if necessary. | Maintain a proper level using one of the Haviland chlorinating products. |
| High Total Alkalinity | Test total alkalinity and adjust accordingly | Lower total alkalinity to their ideal levels using Haviland pH Reducer. |
Green Water
| Green Water Causes | Solution | Preventive Measures |
| Green Algae (hazy water) | Shock the pool using chlorine based shock at 1 lb. per 10,000 gallons. Let circulate overnight and then adjust free chlorine residual to 1 - 3 ppm. | Add Haviland Algae Kil 50 or Haviland Combat 60 every other week at a rate of 6 oz. per 10,000 gallons |
| Copper in Fill water (clear water) | Use Haviland Rust-N-Scale at a rate of 6 oz. per 10,000 gallons. Let circulate overnight before adjusting chlorine or pH. | Add Haviland Rust-N-Scale every other week at a rate of 6 oz. per 10,000 gallons to prevent stains due to copper in the water. |
Reddish Brown Water
| Red/Brown Water Causes | Solution | Preventive Measures | Dissolved Iron or maganese in water | Adjust pH to 7.4 - 7.6 range. Use Haviland Rust-NScale. Let pump run continuously until clear. | Add Haviland Rust-N-Scale every other week at a rate of 6 oz. per 10,000 gallons. |
Eye & Skin Irritation
| Eye Irritation Causes | Solution | Preventive Measures |
| Combined Chlorine (chloramines) level too high | Shock the pool using one of the Haviland shock treatments. Let circulate overnight and then adjust free chlorine residual to 1 - 3 ppm. | Shock treat every other week, after heavy use or rain. Test for free chlorine residual daily |
| pH level too high or too low | Adjust pH by using Haviland pH Increaser or Haviland pH Reducer to bring pH level to ideal range of 7.4 - 7.6 ppm. | Test pH level daily and maintain pH in 7.4 - 7.6 range. |
Chlorine Odor
| Chlorine Odor Causes | Solution | Preventive Measures |
| Combined Chlorine (chloramine) level too high. The cause is NOT too much chlorine but not enough free available chlorine | Shock the pool using chlorine based shock at 1 lb. per 10,000 gallons. Let circulate overnight and then adjust free chlorine residual to 1 - 3 ppm. | Test pH level daily and maintain pH in 7.4 - 7.6 range. |
Calcium Scale Formation
| Calcium Scale Causes | Solution | Preventive Measures |
| pH too high/Total Alkalinity too high | Add Haviland pH Reducer to bring pH into 7.4 - 7.6 ppm range and to bring total alkalinity down to 100 - 175 ppm. | Maintain pH level in 7.4 - 7.6 range. Maintain total alkalinity level in 100 - 175 ppm |
| Calcium Hardness level too high | If hardness level is too high, some water may have to be drained. Add Haviland Rust-N-Scale per label directions. | Add Haviland Rust-N-Scale every other week at a rate of 6 oz. per 10,000 gallons. |
Corrosion of Metal Parts
| Corrosion Causes | Solution | Preventive Measures |
| pH too low/Total Alkalinity too low | Add Haviland pH Increaser to bring pH into 7.4 - 7.6 ppm range. | Maintain pH level in 7.4 - 7.6 range. Maintain total alkalinity level in 100 - 175 ppm. |
| Calcium Hardness level too low | Add Haviland Water Hardness Increaser to raise the calcium to 180 -275 ppm. | Maintain calcium level at 180 -275 ppm. |
Shipping & Returns
Shipping Options
This item ships free via freight truck. This means that the item cannot ship via regular transportation because it is too large, heavy or needs to be palletized. Learn more about receiving an LTL shipment.
Standard ground shipments may be delivered sooner depending on where you are located, and the shipping method used to ship your order. Combining multiple items onto the same order can change the delivery date and expedited shipping costs, especially if the other items are not available for immediate shipment. Transit time is calculated in business days and does not include Saturday and Sunday.
Return Policy
This item can be returned within 30 days of order. See return policy for details and how to place a return.
