HTH Extra Super Chlorine Shock (454 g) – PTL Direct

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Product Details

UPC: CHM-907104

Brand: HTH

HTH Extra Super Shock delivers fast, powerful pool sanitation with 75% available chlorine—15% stronger than regular HTH Shock. Its extra-fine, fast-dissolving formula is ideal for weekly shock treatments and quickly killing algae. Easier to store and handle than liquid chlorine, one convenient pouch provides shock power comparable to approximately 10 litres of liquid chlorine. Perfect for maintaining clear, sparkling pool water with less effort.

HTH Extra Super Chlorine Shock (454 g)

Name: HTH Extra Super Chlorine Shock (454 g)
Brand: HTH
Price: 7.99 CAD
Availability: InStock
Rating: 5 (5 reviews)

C$7.99

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Testimonials

Leave us a review

“Excellent to do business with and top quality pool,,,very happy with the service and delivery”

Ted from: Sault Ste Marie April 17, 2025

“Christina was super helpful and I'm super happy to get such a great pool at this price! Thank you, PTL!”

Stevan Cvjetkovich from: Vancouver October 17, 2024

“I had the pleasure of working with Ptl during COVID. Purchased 21ft round kit, installed it myself with helpful suggestions from Ptl. Have made various purchases since, prices always Competitive (even against Amazon) Whenever I order on line, it is shipped out same day. If I have a comment or question while ordering I get a real voice contacting me and process Is immediately looked after.”

Randy Helmle from: Bowmanville August 22, 2024

“I'd like to say What an excellent job and helpful experience Kristine and Dwayne spending the time and explaining to me the difference between the liners are I just replaced my liner for my pool, and I was very happy. they told me The things that I will need for I put in my liner. I recommend this company very highly and now I know where to go and get my pool supplies. It's worth the drive.”

Tony Vella from: Milton August 1, 2024

“Received my parts today, fast and excellent service. Thank you very much
We needed a new wall and liner for my older pool that I was unable to find anywhere else, this is great and I can't wait to be swimming again. Thank you.”

Edith Vissey from: Prince Edward Island March 20, 2023

“2nd part.
My husband didn't want to do installation so they recommended someone to us, however if there is a problem with installation it is not there responsibility.
That being said the product is great and we have enjoyed our pool tons. We even.bought a heater from them to extend our usage. I would highly recommend them. Love our pool!!!”

Lorna Drys from: Mississauga March 6, 2023

“We bought our above ground pool from this company and haven't had any problems with it. They dont dont do i stallation and my husband didnt even recommended someone to us for installation.”

Lorna Drys from: Mississauga March 6, 2023

How do I maintain proper pool water chemistry?

Do you ship pool supplies across Canada?

Yes — we ship pool supplies Canada-wide to all provinces and territories.

Carriers: UPS, Purolator, Canpar, or FedEx
Transit Times:

ON/QC: 1–3 business days
MB/SK/AB/BC: 2–5 business days
Atlantic & Territories: 3–7 business days

Rates: Calculated at checkout by weight, size, and postal code
Free Shipping: Available over qualifying order thresholds (excludes oversized/remote areas)
Oversized Items: May ship freight with curbside delivery

Tracking: Sent as soon as your order ships

Are your pool supplies suitable for both above-ground and in-ground pools?

Most pool supplies—chemicals, test kits, brushes, hoses, and maintenance tools—work for both above-ground and in-ground pools. Equipment such as pumps, filters, ladders, and liners must be matched to your pool type and size.

If you’re unsure, contact support with your pool details for compatibility assistance.

Can I order replacement pool parts online?

Yes. You can order replacement pool parts online, add them to your cart, and check out easily. We ship across Canada with tracking, and our team can help verify part compatibility before purchase.

How do I maintain proper pool water chemistry?

To balance pool water properly, follow these steps:

Adjust Alkalinity (80–120 ppm)
Raise with sodium bicarbonate; lower with muriatic or dry acid.
Adjust pH (7.4–7.6)
Raise with soda ash; lower with acid.
Balance Calcium Hardness (200–300 ppm)
Increase with calcium chloride; reduce by partially draining/refilling.
Sanitize (1–3 ppm chlorine)
Use tablets, liquid, powder, or a salt chlorine generator. Shock weekly/biweekly.
Check CYA Stabilizer (35–60 ppm; 60–80 ppm for saltwater)
Helps protect chlorine from sunlight.
Monitor Total Dissolved Solids (below 1,200–1,500 ppm)
Drain/refill if levels are too high.
Shock the Pool
Boosts free chlorine to eliminate contaminants.
Test Again
Ensure all levels return to proper ranges.