Best Pool Shock in Harlem , NYC ( 2025 )

HTH 52034 Super Shock Treatment Swimming Pool Chlorine Cleaner, 1 lb (Pack of 6)

★★★★★4.6

(4,567 verified reviews)

Why We Ranked It #1

Claiming the #1 spot, this pool shock stands out with its 4.6/5 rating from 4,567 reviews. NYC customers consistently praise its reliability and performance for city living.

Key Features

✓6-pack of 1 lb bags for convenient weekly treatments
✓Fast-dissolving formula works quickly to restore clarity
✓Kills bacteria and algae for crystal clear water
✓Compatible with all pool types including saltwater systems

Great for HarlemFast Prime Shipping4.6+ Star RatingTop Seller

In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 25 Pounds

★★★★★4.7

(3,123 verified reviews)

Why We Ranked It #2

Securing the #2 position, this option impressed us with its solid 4.7/5 rating across 3,123 reviews. It's an excellent alternative to our top pick with slightly different strengths.

Key Features

✓To view this video download
✓Fast-Acting Algae Control: Calcium Hypochlorite (Cal-Hypo) is an effective non-stabilized chlorine shock treatment, ideal for routine maintenance in your swimming pool
✓Versatile Use: Suitable for above ground or in-ground swimming pools, spas, and hot tubs; Pre-dissolve or dilute to avoid bleaching the liner
✓High Chlorine Content: 65% available chlorine, provides powerful sanitization for crystal-clear water
✓Easy Application: Pre-dissolve or dilute to avoid bleaching swimming pool liners; Spread granules in the deepest part of the pool; Brush if needed

Great for HarlemFast Prime Shipping4.7+ Star RatingTop Seller

Premium Pick

$249.99

In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 24 X 1 Pound

★★★★★4.7

(2,663 verified reviews)

Why We Ranked It #3

Taking third place, this premium option is worth the investment for those wanting top-tier performance. Its 4.7/5 rating from 2,663 buyers reflects exceptional build quality.

Key Features

✓To view this video download
✓Fast-Acting Algae Control: Calcium Hypochlorite (Cal-Hypo) is an effective non-stabilized chlorine shock treatment, ideal for routine maintenance in your swimming pool
✓Versatile Use: Suitable for above ground or in-ground swimming pools, spas, and hot tubs; Pre-dissolve or dilute to avoid bleaching the liner
✓High Chlorine Content: 65% available chlorine, provides powerful sanitization for crystal-clear water
✓Easy Application: Pre-dissolve or dilute to avoid bleaching swimming pool liners; Spread granules in the deepest part of the pool; Brush if needed

Great for HarlemFast Prime Shipping4.7+ Star RatingTop Seller

Best Value

$249.99

HTH 52037R Pool Care Shock Advanced, Swimming Pool Chemical - Cal Hypo Formula, Prevents Bacteria & Algae, Restores Crystal Clear Water - Shock Treatment, 1lb (12 Pack)

★★★★★4.7

(1,735 verified reviews)

Why We Ranked It #4

Our #4 pick offers the sweet spot between price and performance. At its price point with a 4.7/5 rating from 1,735 reviews, it's hard to beat for budget-minded NYC shoppers.

Key Features

✓To view this video download
✓BENEFITS: Stay all clear for cannonballs; This fast-dissolving, convenient 4-in-1 formula kills bacteria and algae, reduces chlorine odor and irritation, and quickly restores crystal clarity
✓FEATURES: Multi-functional shock treatment for weekly use to solve 90% of pool water problems within 24 hours and restore crystal clarity
✓VISIBLY BRILLIANT SPARKLE: This Cal Hypo based formula sanitizes without adding cyanuric acid (CYA) to prevent overstabilization or chlorine lock
✓COMPATIBLE WITH ALL SWIMMING POOLS: This product is great for all pool types including vinyl-lined pools and saltwater systems

Great for HarlemFast Prime Shipping4.7+ Star RatingTop Seller

Best Overall

$199.99

In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 50 Pounds

★★★★★4.7

(2,891 verified reviews)

Why We Ranked It #5

Rounding out our recommendations, this pool shock earned its spot with solid performance and 2,891 positive reviews averaging 4.7/5.

Key Features

✓68% calcium hypochlorite for powerful sanitization
✓50 lb bulk size provides excellent value for large pools
✓Fast-acting algae control for routine maintenance
✓Non-stabilized formula won't raise cyanuric acid levels

Great for HarlemFast Prime Shipping4.7+ Star RatingTop Seller