A convenient way to sanitize and disinfect pool water.
In The Swim has a large collection to choose from!

Pool Shock

Pool shock and super chlorinators for swimming pools help keep your pool free from contaminants. Shock your pool weekly or more often during periods of hot weather or heavy use. In The Swim has a large selection of pool shocks and super chlorinators to choose from.

Pool Shock Treatment

Calcium Hypochlorite
Pool Shock Treatment
65% Minimum Available Chlorine
spring opening
fast chlorine boost
Starting at Price reduced from $84.99 to $71.99 !
1 lb. per 10k gallons

Super Pool Shock Treatment

Calcium Hypochlorite
Super Pool Shock Treatment
70% Minimum Available Chlorine
spring openings
stubborn algae blooms
regular usage
Starting at $46.74 !
1 lb. per 10k gallons provides 5-10 ppm available chlorine

Di-Zap Multi-Shock

Sodium Dichlor
Di-Zap Multi-Shock
56% Available Chlorine
ideal for pools, spas, fountains and water features
Starting at $39.99 !
1 lb. per 10k gallons

Chlorine-Free Shock

Potassium Monopersulfate
Chlorine-Free Pool Shock
38% MPS
chlorine and bromine pools
Starting at $46.74 !
1 lb. per 10k gallons

Instant Liquid Chlorine

Calcium Hypochlorite
Instant Liquid Chlorine
1.07 lb. equivalent to 1 gallon of liquid chlorine
easy and instant!
spring openings
weekly maintenance
Starting at $28.99 !
3-5 oz per 10k gallons
Highly effective, at an economical price!
Keep your swimming pool or spa sparkling clean and contaminant-free.
Price reduced from $179.99 to $143.99
Dichlor Granular Pool Chlorine
A fast dissolving sanitizer that leaves no residue!
Cleaner, clearer water with no added calcium hardness or residue.
$179.99 - $249.99

Shocking Tips

Why Shock?

  • removes visible algae in the pool
  • removes invisible bacteria in the pool
  • removes chloramines and other disinfection byproducts
  • removes cloudy water by oxidizing suspended particles
  • removes organic and inorganic contaminants
  • maintains healthy, sanitary pool water

When to Shock

It is best to shock at night for a couple of reasons:

  • For most shocks, you can’t swim for about 8-10 hours after shocking, so it’s best to do the shocking treatment when you’re done swimming for the day.
  • The sun can eat up the shock because it is not stabilized, so it’s best to shock when the sun isn’t out for maximum performance.

How often to Shock

Many people “shock” their pool, or superchlorinate, once per week. This may not be necessary, unless you have high bather loads, algae or chloramine levels greater than 0.3ppm. A DPD test kit will help you calculate chloramine levels in your pool. If all is well, it may be advisable to shock monthly, to ensure that the water remains sanitary.

How to Shock a Pool

  1. Clean the Pool. Leaves and debris on the floor and surface will waste your chlorine’s killing power, as it attacks these organic materials, rather than the A-B-C problem that we are trying to correct.
  2. Lower the pH. Chlorine is very sluggish at high pH levels. At a pH of 8.0, less than half of the chlorine you add to the water will convert to hypochlorous acid, the killing form of chlorine. Lower the pH to 7.2 before shocking.
  3. Read the Label. We have 8 different types of pool shock, all with slightly different dosages. For some pool shock, dilution in a bucket is necessary to dissolve the granules, to prevent damage to pool surfaces.
  4. Add the Shock. Distribute the granular chlorine throughout the pool surface, with the pool pump running. Be careful not to spill any on your clothing or the pool deck, and don’t broadcast it into the wind!
  5. Brush the Pool. This helps to distribute the chemical, and removes the layer of dust and film on your pool surfaces, which may allow some contaminants to escape treatment. A good brushing, vacuuming and backwashing should follow an algae shock treatment.


For more detailed information, including the A-B-Cs of Pool Shock, Pros and Cons, and Pool Shock Safety, read the In The Swim eGuide.

Read the eGuide »