Pool and Spa Leak Sealer

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LoChlor Leak Sealer - An advanced Liquid Formulation For SEALING MINOR CRACKS & LEAKS in both PIPE WORK and POOL SURFACES


LoChlor Leak Sealer Benefits

Seals minor leaks in most swimming pools & spas
Can seal leaks losing up to 3.5cm of water per day (in a 50K litre pool)
No need to empty pool or spa
Fast acting - usually stops leaks in 24 hours

Important Notes...

NOT suitable for repairing leaks in vinyl liner pools
Larger defects require proper plumbing and maintenance
If using an automatic pool cleaner, remove the cleaner from the pool
Do not allow Leak Sealer to pass through filtration system
Do not exceed recommended dosage rate

1L treats 50,000 Litres pool water

What is LoChlor Leak Sealer?

LoChlor Leak Sealer is a compound that has been developed to help seal minor cracks and leaks in swimming pools. A leaking pool is every pool owner's nightmare. Lo-Chlor has developed an easy way to plug minor leaks.

How does Leak Sealer work?

Leak Sealer has a very high pH (about 12) so when you add it to your pool it takes on the pH of pool water (between 7.0 and 8.0). It now no longer functions as a liquid and starts to solidify in the presence of oxygen at the site of the leak. To ensure best results, please follow the instructions outlined below.


Did you know...?

Lo-Chlor Leak Sealer is sold in more than 25 countries around the world
Lo-Chlor Leak Sealer is the fastest selling and most popular specialty pool and spa chemical in Spain and France
Lo-Chlor Chemicals distributes more than 20,000L a year of Leak Sealer to all corners of the globe.


1. Turn the pool pump OFF. Set the filtration to BY-PASS or RECIRCULATE to avoid the Leak Sealer passing through the filtration system elements when the pump is running. If by-pass or re-circulate is not available, remove filter grids or cartridges from the filter... Leak Sealer will clog the filter system if allowed to pass through it.

2. If Leak location is unknown, add the required volume of Leak Sealer via the skimmer box. Turn the pump off for at least 30 minutes. This allows the Leak Sealer to work slowly through the pipes (this is where 90% of leaks happen, so it makes good sense to allow maximum contact time in this area). If you are sure of the location of the leak, (ex. around a light or the skimmer) pour Leak Sealer directly in the water in the vicinity of the leak

3. Where possible, attach a vacuum hose with vacuum head resting at the deepest point in the pool (normally next to the main drain). Leak Sealer is much heavier than water, so it tends to sink quickly to the deepest point in the pool. The positioning of the vacuum head in this region will assure maximum effect of the product when the pump is turned back on.

4. After 30 minutes have passed, turn the pump on. Allow pump to run for at least 8 hours (24 if possible).

5. The pool should be checked to see if it is still losing water. Minor leaks may benefit from a second application where the leak appears to have slowed but not sealed completely from the initial application. Second application can be made within the next 24 hours.

6. Replace the filter grids or cartridges after 24 hours and resume normal filtration.


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Leaking Pool

By: David Mitchell on 28 January 2021
A very good product. Be careful of using recirculate on old pools and sand filters as it may act as wash cycle and drain the pool. Not sure why. According to manufacturer possible worn out parts on filter. I have ordered another bottle as the pool is at least 45000 litres and although leak is much better the manufacturer suggests another dose may be needed. Well worth the money and definitely worth a try.

Service for replacement pump

By: Ron Fenton on 8 July 2020
Very happy with response and action taken by Direct pool supplies. very professional company.

pool & spa leak sealer

By: jack hoofdakker on 8 August 2019
it works well

Works great

By: Ken on 14 April 2019
Hi, I hadn't had a chance to use it until yesterday afternoon. Worked perfectly - no more leaks. The hardest part was working out how much to use (and that was easy enough). Used in a 850 litre 3 person spa.

Great stuuf

By: Ken on 13 April 2019
Had a small leak in a spa (plumbing) that was very hard to reach. Thought I might give Lochlor Leak Sealer a go, and I'm glad I did. Worked perfectly.

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