How much pool shock do I need for my pool?

The amount depends on your pool size, current chlorine level, and water conditions. Use the Pool Shock Calculator on Standard Chemicals to determine the exact dose based on your pool.

What is calcium hypochlorite pool shock?

Calcium hypochlorite (cal hypo) is a fast-acting, unstabilized chlorine used to quickly raise chlorine levels, kill algae, and restore water clarity without adding cyanuric acid (CYA).

Does calcium hypochlorite add cyanuric acid (CYA)?

No. Calcium hypochlorite does not add cyanuric acid, making it ideal for pools with high stabilizer levels where additional CYA would reduce chlorine effectiveness.

Why is my pool still green even when chlorine levels are high?

A pool can remain green due to algae growth, poor circulation, or high cyanuric acid levels reducing chlorine effectiveness. In these cases, a stronger shock treatment is typically required.

When should I use pool shock instead of chlorine tablets?

Pool shock is used for rapid chlorine increases to treat algae, cloudy water, and contamination, while chlorine tablets are used for slow, ongoing sanitation and maintenance.

Chlorine Tablet Calculator

Enter your pool size and choose whether you want a normal weekly chlorine dose or a heavier dose for hot weather, heavy use, or problem water.

Pool Size (Gallons)

Dosing Level

How many gallons are in my pool?

Not sure how many gallons are in your pool? Enter your pool dimensions in our Pool Size Calculator to estimate your pool size in gallons.

Recommended Chlorine Tablets

3" Chlorine Tablets - 18 lb Pail

Slow dissolving stabilized tablets for consistent pool sanitation.

View Product

How Many Chlorine Tablets Does Your Pool Need?

Chlorine tablets are one of the easiest ways to maintain safe, clean swimming pool water. Slow dissolving stabilized tablets release chlorine gradually, helping maintain consistent sanitation levels throughout the week.

The typical guideline used by pool professionals is:

1 chlorine tablet per 10,000 gallons of pool water per week.

However, pools may require additional chlorine under certain conditions such as high temperatures, heavy swimmer use, rainstorms, or algae growth.

Chlorine Tablet Dosage Guide

Pool Size	Tablets Per Week
10,000 gallons	1 tablet
15,000 gallons	1.5 tablets
20,000 gallons	2 tablets
25,000 gallons	2.5 tablets
30,000 gallons	3 tablets

When Pools Need More Chlorine

Hot summer temperatures
Heavy swimmer usage
Storm debris and rain dilution
Low chlorine test results
Algae or cloudy water

In these cases, pools may require additional chlorine tablets or supplemental pool shock treatment.

Tip: Always test your pool water regularly and adjust chlorine dosing to maintain free chlorine levels between 1-4 ppm.

Not sure whether to use chlorine tablets or pool shock? Learn the key differences between chlorine tablets and pool shock.