Read up on the chemistry of chlorine and break-point chlorination at our Chloramine Info page.

Shock the pool when:

• Combined Chlorine (also called Chloramines) levels are Above 0.3ppm, as determined by your DPD Test Kit, or your nose and eyes. If your eyes are burning, and the smell of chlorine is strong, chloramines may be high.
• Your swimmer load has been considerably heavy for a sustained period of time.
• You want to raise the chlorine level quickly to clear the water or kill algae.

Poolcenter Pool Shock

More powerful and much safer than liquid chlorine!

Swimming pool shock treatments are an essential aspect of spring pool opening but can also be used to give your pool a quick chlorine boost. Pool shock chemicals provide a quick fix for improving chlorine levels in your pool but can also make your pool unsuitable for swimming. Generally speaking, after adding pool chlorine shock to your swimming pool, it is best not to swim for several hours.

• Compare to Sock It , Burn Out , Super-Chlorinator and Power Powder .
• Powerful chlorinated shock treatment is great for Spring start-up!
• Ideal for a quick chlorine boost when fast-action is needed!
• Dilute with water before adding to swimming pool water.
• 68% Calcium Hypochlorite.
• Initial Dosage: 1 lb. per 10,000 gallons

= HAZ MATS. Can't be shipped 2nd Day Air or Next Day Air
Shock can only be shipped inside of the 48 states. No Alaska / Hawaii shipments.

Poolcenter Super Pool Shock

The strongest start-up and algae-killing pool shock!

Our pool super shock contains more chlorine than any other swimming pool shock formula and also acts faster to kill contaminants. Poolcenter.com's super pool shock will ensure that your swimmers are provided with a clean and sanitary swimming environment so they will be protected against illnesses, infections and cloudy, unsightly water.

• Fast dissolving and fast acting.
• Extremely powerful and effective chlorinated shock treatment.
• Ideal for spring openings, stubborn algae blooms and regular usage.
• Can quickly take your pool water from cloudy to crystal clear. Will make your pool water sparkle. Easy to store and easy to use.
• Provides the best results for your money.
• Available in convenient 1 pound bags.
• Dosage: 1 pound per 10,000 gallons.

How to use:
Add the recommended dosage of this product during evening hours while the filter pump is running. When adding this product to your pool, broadcast the product evenly over a wide area in the deepest part of the pool. Use entire contents when opened. If any granules settle to the bottom of the pool, use brush to disperse.

= HAZ MATS. Can't be shipped 2nd Day Air or Next Day Air
Shock can only be shipped inside of the 48 states. No Alaska / Hawaii shipments.

Poolcenter Chlorine-Free Pool Shock

Use chlorine free pool shock on a weekly basis to prevent algae growth and kill harmful organic contaminants, such as bacteria. Safer than common chlorine-based pool shock, you can swim immediately after use - no more waiting! Non-chlorine Pool Shock is ideal for weekly maintenance treatments.

POOLCENTER.com's chlorine free pool shock works well with bromine, & burns off dead chlorine cells to increase the amount of free chlorine in your pool water. Provides your pool with more fighting power to kill off contaminants & keep pool water safe & clean.

• Compare our chlorine free pool shock to Oxy-Brite , Impact and Shocktrine .
• Chlorine free swimming pool shock is ideal for weekly pool shock treatments.
• Great for use in bromine sanitized swimming pools.
• Does not contain any harsh chemicals.
• Safe enough to swim right after treatment.
• Will not raise the calcium hardness level of your pool water.
• Has a neutral pH.
• Will not affect other swimming pool chemical levels.
• POOLCENTER.com's chlorine free pool shock contains 43% Potassium Monopersulfate.
• Our chlorine free pool shock comes in convenient 1 pound bags.

= HAZ MATS. Can't be shipped 2nd Day Air or Next Day Air
Shock can only be shipped inside of the 48 states. No Alaska / Hawaii shipments.

HTH Shock N' Swim Chlorine Pool Shock

Experience the very best of power and safety with HTH Shock N' Swim!

HTH shock is a powerful product that will give your swimming pool a fast chlorine boost to kill off bacteria, algae and other organic contaminants. HTH pool shock will also improve the appearance of your pool water by restoring clarity, polish and brilliance. And as the name implies, you can start swimming right after shocking the pool!

Shock N' Swim Features:

• Powerful yet safe shock product!
• HTH Sock n' Swim contains 45% available chlorine.
• Contains calcium hypochlorite.
• Will control algae, bacteria and other organic contaminants.
• Will polish dull water and restore water clarity.
• HTH shock makes pool water feel softer.
• HTH pool shock is buffered to reduce pH fluctuations.
• Ideal for weekly use and for killing existing algae.
• Safe enough for swimming directly after treatment.
• Use HTH shock on a weekly basis to prevent algae growth.
• Dosage = 1 to 2 pounds per 11,500 gallons.

HAZ MAT. Can't be shipped 2nd Day Air or Next Day Air. Shock can only be shipped inside of the 48 states. No Alaska / Hawaii shipments.

HTH Super Shock 'n Swim Pool Shock

Give your pool a blast of algae and germ-killing power with HTH Super Shock N Swim!

HTH Super Shock N Swim is a powerful, effective formula made from a patented process. It's 15% stronger than regular HTH shock and contains 53% available chlorine for incredible germ-killing power.

• HTH pool super shock is ideal for weekly preventative shock treatments as well as killing existing algae.
• Ideal for use with vinyl, concrete and all other swimming pool surfaces.
• Safe enough for swimming immediately after shock treatments.
• Add HTH Super Shock while your filter pump is running.
• Formula is buffered to reduce pH fluctuations.
• Fast dissolving formula.
• Contains calcium hypochlorite.
• Dosage = 1 pound per 12,000 gallons.

= HAZ MATS. Can't be shipped 2nd Day Air or Next Day Air
Shock can only be shipped inside of the 48 states. No Alaska / Hawaii shipments.