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Zodiac UV Blockout Chlorine Stabiliser 1kg – Pool Chemical

Name: Zodiac UV Blockout Chlorine Stabiliser 1kg – Pool Chemical
Brand: Zodiac
SKU: WPQBO1
Price: 15.00 AUD
Availability: InStock
Rating: 94 (3 reviews)

Rating:

94% of 100

Fast-dissolving cyanuric-acid stabiliser that shields chlorine from sunlight, reducing UV loss and helping sanitiser remain effective for longer.

- Satisfaction Guarantee: If you are not satisfied with a product for any reason, you are welcome to return it to us for a full refund or exchange within 30 days of the purchase date - even if you have used the product. Returns are free, and we will cover return shipping.

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You are welcome to return any product for a refund or exchange. See terms below.

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Returns are free, there are no fees. We also make sure returns are easy to organize and processed promptly.

Satisfaction Guarantee

We stock quality pool and spa equipment and supplies from the most renowned manufactures in Australia and the world and we are confident that you will be very pleased with your purchase. If for any reason you are not satisfied with a product, you are welcome to return it to us for a refund or exchange within 30 days of the purchase date. The refund will be issued to the full amount paid for the product including shipping.

Terms

You must contact us within 30 days of the date of purchase.
The product must be returned in good conditions.
Products damaged because of incorrect use, negligence or misuse will not be accepted.
All components, accessories and original packaging must be returned.
A copy of the original receipt must be included with the return.
Products must be shipped or returned to our Penrith NSW warehouse using a pre-paid label we will supply.

If you have any questions about our return policy, please contact us on 1300 766 619 or through our "contact us" form.

How to return a product

For more details including the steps required to return a product click here

In stock

SKU

WPQBO1

$15.00

Seen it cheaper?

Product Description

Longer-Lasting Chlorine Under the Australian Sun

Zodiac UV Blockout is a fast-dissolving granular stabiliser for outdoor swimming pools. Commonly known as pool sunscreen, it protects chlorine from breakdown caused by direct sunlight.

Its cyanuric-acid formula supports a steadier sanitiser residual, helping chlorine remain active for longer between regular treatments.

Features & Benefits

Protects chlorine from UV rays: Helps reduce sanitiser loss in outdoor pools.
Fast-dissolving granules: Provides a practical way to raise or maintain the pool’s stabiliser level.
Longer-lasting chlorine: Supports more consistent sanitiser performance between treatments.

How to Use

Test the pool’s current cyanuric-acid level and calculate the required dose.
For media-filter systems, clean or backwash the filter first, then add the granules through the skimmer basket while the pump is running.
For cartridge-filter systems, dissolve the granules in a bucket of water before adding the solution to the pool.
Run the pump for at least 8 hours after application.
Do not clean or backwash the filter for 48 hours while the product dissolves.

Dosage & Coverage

Dosage: Add 200g per 10,000 litres of pool water.
Stabiliser increase: Raises the cyanuric-acid level by 20ppm.

Important Usage Information

For most outdoor pools, maintain cyanuric acid between 30–50ppm.
For pools using a chlorinator with an ORP probe, keep cyanuric acid below 20ppm and ideally as close to zero as practical.
Do not allow the cyanuric-acid level to exceed 100ppm.
Do not mix directly with chlorine or other pool chemicals. Add each product separately.

After treatment, continue regular water testing and maintain free chlorine at 2–4ppm and pH at 7.2–7.6. Keep Total Alkalinity at 80–120ppm for fully tiled, pebble and plaster pools, or 125–150ppm for vinyl and fibreglass pools.

A Better Pool Experience Starts with the Right Chemistry

Zodiac pool chemicals support the key parts of everyday water care, from balance and sanitising to algae prevention, clarity, stain control and equipment protection.

Each product has a clear role in helping pool water stay cleaner, more comfortable and easier to manage, so the pool feels ready to enjoy more often.

Frequently Asked Questions

How is UV Blockout different from UV Blockout Tablets?

Zodiac UV Blockout uses fast-dissolving granules to raise the pool’s cyanuric-acid level. Zodiac UV Blockout Tablets provide pre-measured 500g slow-release doses for convenient skimmer-box application.

Does Zodiac UV Blockout sanitise the pool?

No. UV Blockout is a chlorine stabiliser, not a sanitiser. It protects chlorine from sunlight but does not replace the chlorine required to sanitise the pool water.

Why should the cyanuric-acid level remain below 100ppm?

While cyanuric acid protects chlorine from sunlight, excessive levels can slow chlorine activity and make sanitiser control more difficult. High stabiliser levels usually need to be corrected by partially draining the pool and replacing the removed water with fresh water.

Why do ORP-controlled pools require less cyanuric acid?

ORP probes measure the sanitising activity of chlorine rather than the total free-chlorine level. Cyanuric acid binds with free chlorine to protect it from UV rays, but at higher levels this can reduce chlorine reactivity and lower the ORP reading. The control system may then respond by adding more chlorine in an attempt to reach its target reading, so cyanuric acid should be kept below 20ppm and as close to zero as practical in ORP-controlled pools.

Why should the filter be cleaned before adding UV Blockout?

Cyanuric-acid granules dissolve gradually. Cleaning or backwashing a media filter before treatment helps avoid the need for another filter clean during the following 48 hours, when undissolved product could otherwise be removed from the system.

Image shows product in new packaging design. Actual product received may vary while previous label design is being sold through.

Specifications

More Information
SKU	WPQBO1
GTIN	9317545298702
Barcode	WC000426
Brand	Zodiac
Model	WC000426 - UV Blockout 1Kg Box
Product Type	Pool Chemical
Shipping Type	Standard
Chemical Type	Stabiliser / Sunblock
Chemical Function	Chlorine Stabiliser, UV Protector
Active Constituents	Cyanuric acid: 1000g/kg

Reviews

Documentation

Shipping & Returns

Shipping

Same-day dispatch applies to orders received by 12.00 pm (AEST) during business days. Orders received after 12.00 pm and on weekends or public holidays will be dispatched on the next business day.

Delivery fees are $19.95 flat-rate per order Australia-wide, no matter how many products are in it. Orders containing bulky items like sand filters, acoustic boxes, heat pumps, pool covers, and pool slides may incur additional fees as they require specialized carriers.

Below are the estimated time to arrival in business days once an order is shipped.

Destination	Sydney	NSW	VIC	QLD	SA	WA/NT
Business Days	1 - 2	2 - 4	2 - 4	2 - 4	3 - 4	5 - 6

Rural and remote addresses, where delivery is not provided every day, may take longer.

Returns

- Satisfaction Guarantee: If you are not satisfied with a product for any reason, you are welcome to return it to us for a full refund or exchange within 30 days of the purchase date - even if you have used the product. Returns are free, and we will cover return shipping.

We take full responsibility for the safe arrival of the products that you order from us. We will replace at our expense any product that arrives faulty, damaged during transit, or is the incorrect product. Click here for details

If you have any questions about our shipping policy or our return policy, please contact us on 1300 766 619 or through our contact us form.