10 bestPool Shockof July 2025
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1
Multi Pool Shock Treatment – (450g Each) - Fast-Acting Granular Chlorine Shock - Clarifier, Buffer & Stain Inhibitor - Available Chlorine for Crystal Clear Water - By Pool Supplies Canada (Pack of 12)
Pool Supplies Canada
9.8
2
Multi Pool Shock Treatment (Pack of 6 | 450g Each) Fast-Acting 6-in-1 Granular Chlorine Shock + Clarifier, Buffer, Stabilizer, Softener, Stain Remover - for A Crystal Clear Swimming Pool
Pool Supplies Canada
9.6
3
Premium Pool Shock Chlorinating Granules (65% Available Chlorine) (7kg / 15lbs)
Aqua Coastal
9.3
4
BioGuard Smart Shock Case (12 x 400g Bags) 6 in 1 Compound Shock (SKU 2446)
BioGuard
9.0
5
Pool Shock Treatment & Conditioner – 3 Pack (450g Each) - Fast-Acting Granular Chlorine Shock - Multi Formula: Clarifier, Buffer, Stabilizer, Softener, Stain & Scale Inhibitor - Pool Supplies Canada
Pool Supplies Canada
8.7
Other
Next Gen Hot Tubs Shock – Calcium Hypochlorite Pool & Hot Tub Treatment – 2kg (4.4 lbs) – 70% Available Chlorine – Powerful Algae Eliminator & Water Clarifier
BioGuard Oxysheen Chlorine-Free Pool Shock (3.25 kg) - Granular - SKU 2866
BioGuard Burn-Out Granular Chlorine Shock (12 Bag Case X 400g) (SKU 2448)
Dazzle Ultra Shock (2.75 kg) Weekly Shock (SKU DAZ02502)
6
HTH EXTRA HTH Extra Super Shock 6kg 30640
Epiken
8.4
7
Pool Shock Treatment & Conditioner (450g) - Fast-Acting Granular Chlorine Shock - Multi Formula: Shock, Clarifier, Buffer, Stabilizer, Softener, Stain & Scale Inhibitor - Pool Supplies Canada
Pool Supplies Canada
8.1
8
Non-Chlorine Oxidizer Shock for Pools & Hot tubs (1 Kg)
Aqua Coastal
7.8
9
BioGuard Burn-Out 3 (8kg) Multipurpose Granular Chlorine (SKU 2963)
BioGuard
7.5
10
Non-Chlorine Pool Shock Treatment/Oxidizer – 1 Kg Fast-Acting Pool Shock – Won’t Raise pH Level – Compatible with Chlorine & Bromine Pools – by Pool Supplies Canada
Pool Supplies Canada
7.2
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A Guide to Selecting the Best Pool Shock
Choosing the right pool shock is important for keeping your pool water clean, clear, and safe for swimming. Pool shock is a chemical treatment that helps eliminate contaminants, bacteria, and algae that regular chlorine may not fully handle. When picking a pool shock, you should consider your pool’s size, how often it’s used, and any specific water issues you’re facing. Understanding the key specifications will help you select a product that matches your needs and keeps your pool in top condition.
Type of Shock
Pool shock comes in different types, mainly chlorine-based (calcium hypochlorite, sodium dichlor) and non-chlorine (potassium monopersulfate). Chlorine-based shocks are powerful and good for killing bacteria and algae, but they can temporarily raise chlorine levels and sometimes affect water balance. Non-chlorine shocks are gentler, don’t add chlorine, and let you swim sooner after treatment. If you need a strong clean after heavy use or algae, go for chlorine-based. For regular maintenance or if you want to swim soon after shocking, non-chlorine is a better fit.
Available Chlorine Content
This spec tells you how much active chlorine is in the shock, usually shown as a percentage. Higher percentages mean a stronger, faster-acting product. Shocks with 65-75% available chlorine are considered strong and are best for heavy cleaning or dealing with algae blooms. Lower percentages (around 40-50%) are milder and suitable for routine maintenance. If your pool often has heavy use or frequent water problems, a higher percentage is helpful. For regular upkeep, a lower percentage is usually enough.
Dissolving Speed
Dissolving speed refers to how quickly the shock dissolves in water. Fast-dissolving shocks are less likely to leave residue or cause staining, making them ideal for vinyl or painted pools. Slower-dissolving shocks may be fine for concrete pools but can settle on the bottom if not mixed well. If you want a hassle-free experience and have a sensitive pool surface, choose a fast-dissolving shock. For less sensitive surfaces, dissolving speed is less critical.
Stabilized vs. Unstabilized
Stabilized shocks contain cyanuric acid, which helps protect chlorine from being broken down by sunlight. Unstabilized shocks do not, so the chlorine works quickly but doesn’t last as long in sunny conditions. If your pool is outdoors and gets a lot of sun, a stabilized shock can help maintain chlorine levels. For indoor pools or nighttime shocking, unstabilized is usually fine.
Form (Granular vs. Liquid)
Pool shock is available in granular and liquid forms. Granular shock is more common and easy to store, but it needs to be dissolved in water before adding to the pool. Liquid shock is ready to use and acts quickly, but it’s heavier and has a shorter shelf life. If you want convenience and quick action, liquid is a good choice. If you prefer something that’s easy to store and measure, granular is often better.
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