Pool Shock & Chemicals | Discount Pool Mart

Need pool shock today? Most pools run on two products. The first is a shock, either a chlorine shock (cal-hypo or dichlor) or a non-chlorine shock. The second is an everyday sanitizer that holds chlorine steady between treatments. We stock every type across 10,000+ in-stock SKUs at Discount Pool Mart, and you can pick up your order the same day at a store near you.

Shop In-Stock Pool Shock below, or find a store for pickup before you head out.

Shop Pool Shock and Chlorine In Stock Today

Finding a green pool on a Saturday morning is stressful enough. Waiting three days for a box to ship makes it worse. That's why this collection shows in-stock products first. Each listing carries an in-stock badge pulled from live inventory, and you can filter by shock type, pool or spa, size, or pickup today.

Poolife Rapid Shock is labeled at 68% calcium hypochlorite and Poolife Turboshock at 78% calcium hypochlorite.

Popular picks in the aisle right now:

Poolife Rapid Shock Pool Shock Treatment, labeled at 68% calcium hypochlorite
Poolife Turboshock Pool Shock Treatment, labeled at 78% calcium hypochlorite
Leisure Time Renew non-chlorine shock, 2.2 lb and the 5 lb size, both made for spas and hot tubs
Leisure Time Replenish Shock Oxidizer, 2 lb

You'll find Poolife, Leisure Time, United Chemicals, and HASA on our shelves. Each product listing shows the current price.

Types of Pool Shock We Carry: Cal-Hypo, Dichlor, and Non-Chlorine

What is pool shock? It's a concentrated dose of oxidizer added to pool or spa water. Shock breaks down sweat, sunscreen, and other organic waste. Chlorine-based versions also raise free chlorine, which kills bacteria and algae. Your everyday sanitizer keeps things in check, but it can't do that heavy reset on its own.

Let's break it down by type.

Calcium Hypochlorite (Cal-Hypo) Shock

Cal hypo pool shock is a fast-acting chlorine sold as dry granules. Because it's unstabilized, it adds no cyanuric acid to your water. Water utilities also use calcium hypochlorite widely to disinfect drinking water. Check the label for the available chlorine percentage, since it varies from product to product.

Dichlor Shock

Dichlor (sodium dichloroisocyanurate) is a stabilized chlorine in granule form. It dissolves quickly and adds cyanuric acid every time you use it. That stabilizer shields chlorine from the sun, but it also builds up over time.

Non-Chlorine Shock (Potassium Monopersulfate)

Non-chlorine shock is an oxygen-based oxidizer. It clears out waste without raising free chlorine. Spa owners like it, and so does anyone who just wants a light routine oxidation.

Type	Chemical name	Chlorine-based?	Adds stabilizer (CYA)?	Typical use	Pool / Spa
Cal-hypo	Calcium hypochlorite	Yes	No	Heavy-duty swimming pool shock treatment, algae	Pool
Dichlor	Sodium dichloroisocyanurate	Yes	Yes	Stabilized shock, vinyl and spa use	Pool and spa
Non-chlorine	Potassium monopersulfate (MPS)	No	No	Routine oxidizing, swim-soon situations	Pool and spa
Liquid	Sodium hypochlorite	Yes	No	Shocking and daily sanitizing	Pool

Not sure how much to add or when? Our guide on how to shock a pool walks you through dosing and timing.

For a second opinion on the trade-offs between shock types, Swim University covers them in this video:

HASA Liquid Chlorine: Available Through Our Authorized Dealer Counter

Searching for pool shock liquid? HASA liquid chlorine is sodium hypochlorite, so it does double duty as a daily sanitizer and a sodium hypochlorite pool shock. HASA manufactures it, and Discount Pool Mart is a HASA authorized dealer. You won't find HASA liquid chlorine at big-box stores.

I'll be honest: plenty of LA pool owners switch to liquid once they try it. Here is why. It adds no stabilizer and no calcium, and it starts working fast. Our HASA liquid chlorine guide covers safe use, and we're building a dedicated HASA pool chemicals page.

Ask at the dealer counter. Our staff can tell you which container sizes your store has in stock today.

Everyday Sanitizers: Chlorine Tablets, Granules, and Liquid

Trichlor Chlorine Tablets

These slow-dissolving, stabilized tabs go in feeders and floaters. They hold a steady chlorine level all week long.

Granulated Chlorine

Chlorine granules let you hand-dose a quick top-up between treatments.

Liquid Chlorine (Sodium Hypochlorite)

Liquid chlorine belongs to the same product family as HASA. You can use it daily or reach for it when it's time to shock.

Shock or sanitizer? A sanitizer keeps chlorine steady from day to day. Shock is the occasional heavy hit. Most pools need both, which is why so many customers buy pool shock and chlorine in the same trip. Stabilized products raise CYA, so read up on what cyanuric acid does before you stack them.

Algaecides, Clarifiers, and Specialty Treatment Chemicals

Algaecide

Algaecide backs up your chlorine and helps keep algae from returning. Already fighting a bloom? Here's how to treat pool algae.

Clarifier

Clarifier clumps fine particles together so your filter can catch them. In my view, it's the best partner for shock when you need to fix cloudy pool water.

Specialty Treatments

United Chemicals No Mor Problems comes in a 1 gallon jug and a 1 qt bottle. Follow its label directions exactly.

Which Pool Chemicals Do You Need? A Quick Shopping Checklist

Situation	What to buy
Routine weekly care	Trichlor tabs or liquid chlorine, plus non-chlorine or chlorine shock
Pool party or heavy use	Chlorine shock or HASA liquid chlorine
Cloudy water	Chlorine shock plus clarifier
Green or algae	Cal-hypo or liquid chlorine plus algaecide
Spa or hot tub	Non-chlorine shock (MPS) or dichlor
Opening the pool	Chlorine shock, algaecide, clarifier, sanitizer

Test your water before you buy anything. A quick reading shows what's actually off, so you don't spend money fixing the wrong problem. Learn how to test your pool water, then check your results against our pool water chemistry guide.

Same-Day Local Pickup on 10,000+ In-Stock SKUs

Pickup takes three steps. Find a product with the in-stock badge, order it online, and collect it at your local store the same day. Between 10,000+ in-stock SKUs and a HASA authorized dealer counter, you can grab chemicals, test kits, and parts in one stop. Choose your store on our Los Angeles locations page to check current hours.

Three steps for same-day pickup: find a product with the in-stock badge, order it online, and collect it at your local store the same day.

Safe Storage and Handling of Pool Chemicals

Warning: Always follow the product label directions.

Keep each chemical in its original container.

Store them separately in a cool, dry, ventilated place.

Keep them out of reach of children and pets.

Never mix chemicals or different shock types.

A checklist for storing pool chemicals: follow label directions, keep the original container, store separately somewhere cool, dry, and ventilated, keep away from children and pets, and never mix…

Pool Shock FAQ

Does pool shock increase chlorine?

Yes, if it's chlorine-based. Cal-hypo, dichlor, and liquid chlorine all raise free chlorine. Non-chlorine MPS shock oxidizes the water without adding any.

What is the difference between chlorine and pool shock?

Chlorine sanitizers maintain a steady daily level. A pool shock treatment is a stronger, occasional dose that oxidizes built-up waste.

Is liquid chlorine the same as pool shock?

It can be. Sodium hypochlorite, like HASA, works as both a sanitizer and a shock.

Can I pick up pool shock today?

Yes. Items with the in-stock badge are ready for same-day local pickup.

How much shock do I need, and when can I swim again?

Start with the product label, then follow our step-by-step shocking guide.

Next steps: Shop In-Stock Pool Shock now, or stop by and Visit the HASA Dealer Counter at your local store.

Sources

Related: pool water chemistry