Before You Shock Your Pool… Read and Watch This First

Shocking your pool may seem simple, but doing it the wrong way — or at the wrong time — can waste chemicals and still leave you with cloudy or green water.

1. Test Your Water First

Before shocking your pool, always test your water chemistry. If your pH or alkalinity levels are off, shock may not work properly.

Check pH before adding shock
Make sure alkalinity is balanced
Know your chlorine level before treatment

Bring a water sample into one of our E-Z Test Pool Supplies locations for professional water testing and recommendations.

2. Shock at Dusk or Night

Sunlight can quickly burn off chlorine, especially during hot summer days. Shocking your pool during the day can reduce effectiveness and waste product.

For best results, shock your pool at dusk or in the evening while your pump is running.

3. Run Your Pool Pump

Always run your filtration system while shocking the pool. Proper circulation helps distribute chemicals evenly and improves results.

We recommend running your pump during treatment and for several hours afterward to help maximize water clarity and sanitizer performance.

4. Don’t Swim Right Away

After shocking your pool, chlorine levels may temporarily become too high for swimming. Always follow the product directions and wait until chlorine returns to a safe level before getting back in the water.

5. Green or Cloudy Water May Need More Than Shock

If your pool is green, cloudy, or losing chlorine quickly, shock alone may not fully solve the problem. The issue could be low stabilizer, poor circulation, high phosphates, algae growth, or dirty filters.

That’s why professional water testing makes all the difference.

Popular Pool Shock Products We Carry

At E-Z Test Pool Supplies, we carry a variety of pool shock options to help keep your water clean, clear, and swim-ready all season long.

Smart Shock

A great option for routine pool care and maintaining clean, clear water.

Burnout Shock

A powerful shock treatment for regular maintenance and tough pool water problems.

GLB Pool Shock

Fast-dissolving pool shock designed to quickly improve sanitizer levels and water clarity.

Quick Shock

An easy-to-use shock option for fast pool water treatment.

Not Sure Which Shock You Need?

Every pool is different. Bring a water sample into any E-Z Test Pool Supplies location and our team can help recommend the right shock treatment based on your pool size, water condition, chlorine type, and swimming frequency.

Shop Pool Shock Products

Visit us in Plaistow, NH, Derry, NH, or North Reading, MA — or shop online anytime.