---
product_id: 451659197
title: "52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (6 Pack)"
brand: "hth"
price: "$217"
currency: NZD
in_stock: true
url: https://www.desertcart.nz/products/451659197-52040b-swimming-pool-care-shock-ultra-swimming-pool-chemical-cal
store_origin: NZ
region: New Zealand
---

# Fast-acting Cal Hypo formula Compatible with all pool types Visible blue action indicator 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (6 Pack)

**Brand:** hth
**Price:** $217
**Availability:** ✅ In Stock

## Summary

> 🔵 Shock your pool into crystal-clear brilliance!

## Quick Answers

- **What is this?** 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (6 Pack) by hth
- **How much does it cost?** $217 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/451659197-52040b-swimming-pool-care-shock-ultra-swimming-pool-chemical-cal)

## Best For

- hth enthusiasts

## Why This Product

- Trusted hth brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **No Chlorine Lock:** Cal Hypo formula avoids cyanuric acid buildup for consistent, effective sanitation
- • **Visible Blue Action:** Instant visual confirmation that your pool is getting the care it deserves
- • **Pro-Level Pool Health:** Use with HTH 6-Way Test Strips to solve 90% of pool issues within 24 hours
- • **Powerful All-in-One Shock:** Boost chlorine, banish bacteria, algae, stains & scale in one easy step
- • **Universal Pool Compatibility:** Safe for vinyl-lined, saltwater, and all pool types—no compromises

## Overview

HTH 52040B Swimming Pool Care Shock Ultra is a fast-acting, granular Cal Hypo formula designed to sanitize all pool types without adding cyanuric acid. Its unique visible blue action confirms effectiveness while preventing chlorine lock, killing bacteria, algae, stains, and scale. Ideal for maintaining crystal-clear, soft water with reduced skin and eye irritation.

## Description

HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (6 Pack)

## Features

- BENEFIT: Use this all-in-one powerhouse pool shock to increase chlorine levels, prevent bacteria, algae, stain, and scale, reduce skin and eye irritation, improve filtration, and soften your swimming pool water quickly and easily
- VISIBLY BRILLIANT SPARKLE: This Cal Hypo based formula sanitizes without adding cyanuric acid (CYA) to prevent overstabilization or chlorine lock
- VISIBLE BLUE ACTION: This built-in feature lets you know the product is working
- COMPATIBLE WITH ALL SWIMMING POOLS: This product is great for all pool types including vinyl-lined pools and saltwater systems
- YOU'RE ALL CLEAR WITH HTH: For best results, use with HTH 6-Way Test Strips to test and balance your swimming pool water twice weekly; Use weekly to solve 90% of pool problems within 24 hours and restore crystal clarity

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Product Benefits | Kills Bacteria |
| Item Form | Granular |
| Item Weight | 6.3 Pounds |

## Product Details

- **Brand:** HTH
- **Item Weight:** 6.3 Pounds
- **Item Form:** Granular
- **Product Benefits:** Kills Bacteria
- **UPC:** 073187520401

## Images

![52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (6 Pack) - Image 1](https://m.media-amazon.com/images/I/81aKILdYRbL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Questions & Answers

**Q: Can this replace weekly chlorine?**
A: 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.

**Q: What is the percentage of available chlorine?**
A: This product has 56.44% available chlorine.

**Q: How long do you have to wait after adding shock before you can swim?**
A: 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.

**Q: 1 bag treats how many gallons water**
A: 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.

## Frequently Bought Together

- HTH 52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (6 Pack)
- HTH 67067 Swimming Pool Care Clarifier Advanced - Crystal Clear Water in 24 Hours
- HTH 52038 Swimming Pool Care Green to Blue, Advanced Shock System, 2-Step Swimming Pool Care Solution, 1 Kit

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**Shop now:** [https://www.desertcart.nz/products/451659197-52040b-swimming-pool-care-shock-ultra-swimming-pool-chemical-cal](https://www.desertcart.nz/products/451659197-52040b-swimming-pool-care-shock-ultra-swimming-pool-chemical-cal)

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-28*