Can this replace weekly chlorine?

This is a sanitizer that is used as weekly shock or your regular sanitizer maintenance. The amount you use for weekly shock and the amount for maintenance is different based upon the pool water volume. Ideally, this is used for Shock but we can help with regular maintenance dose if you choose to not use a tablet in your skimmer. Please consider calling our Consumer Engagement Team for more precise recommendations and dosing details. We're available M-F, 9 AM - 7 PM at 866-484-7665.

What is the percentage of available chlorine?

This product has 56.44% available chlorine.

How long do you have to wait after adding shock before you can swim?

The general rule is to wait at least an hour per pound of granular product, to allow it to dissolve and dilute properly. Before you enter the pool, make sure to test and that the chlorine level is between 1-4 ppm (and NOT ABOVE 5 ppm) for the safest swimming.

1 bag treats how many gallons water

We are the manufacturer of HTH® Pool Care Shock Ultra and one of our 1 lb. bags treats 13,500 gallons of swimming pool water. If you have any more questions just give us a call at 866-484-7665.

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52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, CalhiPo Formula, 1 Pound (Pack of 6)

Product ID: 724940680

Details

Brand
HTH
Item Weight
2.86 kg
Item Form
Granular
Product Benefits
Kills Bacteria
UPC
073187520401

💧Fast-acting chlorine boost

🔵Visible blue action indicator

🧪Cal-Hypo formula, no chlorine lock

$293.56

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💦 Shock Your Pool to Perfection—See the Blue, Feel the Clean!

VISIBLE BLUE ACTION - Instantly know the shock is working with a unique blue indicator—no guesswork needed.
SAFE FOR ALL POOL TYPES - Perfectly compatible with vinyl-lined and saltwater pools, ensuring universal pool care.
POWERFUL ALL IN ONE SHOCK - Elevate pool hygiene by eliminating bacteria, algae, and grime with a single treatment.
REDUCES SKIN EYE IRRITATION - Gentle on swimmers while tough on contaminants, making every swim comfortable.
CRYSTAL CLEAR WATER IN 24 HOURS - Experience visibly brilliant, softened water that invites you to dive in.

HTH 52040B Swimming Pool Care Shock Ultra is a 1 lb cal-hypo based chlorine shock designed to rapidly disinfect and clarify all types of swimming pools. Its unique visible blue action confirms effectiveness while preventing chlorine lock by excluding cyanuric acid. Safe for vinyl and saltwater pools, it reduces skin and eye irritation and restores crystal-clear water within 24 hours of weekly use.

Specifications

ASIN	B09R81TQBS
Amazon Bestseller	#571,303 in DIY, Tools & Garden ( See Top 100 in DIY, Tools & Garden ) #18 in Swimming Pool Chlorine
Brand	HTH
Brand Name	HTH
Customer Reviews	4.7 out of 5 stars 534 Your Review
Included Components	HTH 52040B Swimming Pool Care Shock Ultra
Item Form	Granular
Item Type Name	HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, CalhiPo Formula, 1 Pound (Pack of 6)
Item Weight	6.3 Pounds
Manufacturer	Innovative Water Care
Number of Items	1
Product Benefits	Kills Bacteria
UPC	073187520401
Unit Count	6.0 Count

Reviews

T**I

The only kind we purchase!

17.09.2025

K**N

My go to. Great product

11.04.2026

J**V

Works well!

31.10.2025

A**H

Great quality

24.12.2025

K**1

Great buy shock

30.11.2025

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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The product exactly matches the description. Very satisfied with my purchase.

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$293.56

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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2 months ago

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Excellent communication throughout the order process. Product is perfect.

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