What is HTH in pool?
Andrew Mclaughlin
Updated on March 01, 2026
Apply HTH® premium shock products every week to boost your chlorine levels and destroy unwanted bacteria and algae. HTH® shock treatments deliver the strongest available chlorine to your pool for the cleanest, clearest, swim-worthy water.
How often should I throw HTH in pool?
Maintenance
| Free Available Chlorine (FAC) | |
|---|---|
| What Is It? | The amount of active chlorine in the water |
| When To Test | Every day |
| Ideal Range | 1-4 ppm when using chlorine as the sanitizer |
| Product Used to Adjust | Any HTH® granular or tablet chlorine sanitizer according to label directions |
Can you swim after adding HTH?
It is recommended to wait at least 20 minutes to an hour after adding water balancing chemicals. You should wait 2-4 hours (or one full cycle through the filter) to swim from the moment you use calcium chloride in your pool. It is safe to swim once your chlorine levels are around 5 ppm or after 24 hours.
What is HTH made from?
The key active ingredient in HTH Chlorinating Granules, calcium hypochlorite is the Grim Reaper of bacteria, algae, fungi, slime, and other swimming pool creeps.
Is HTH a chlorine?
HTH Granular Pool Chlorine is a non-stabilised chlorine that kills any algae and harmful bacteria in your pool. This rapidly dissolving chlorine can also be used as a shock treatment for your pool, maintaining the pH between 7.2-. 7.6 in marbelite pools or 7.0-7.2 in fibreglass pools.
How long after HTH shock Can you swim?
When is it safe to go into a pool after it’s shocked? In general, it’s recommended that you wait up to 24 hours to hop into a pool after it’s been shocked, depending on the size of the pool, Alan says.
How long does an HTH floater last?
The slow-release chlorine in this large floater treats up to 70 000 litres of pool water….HTH Plus Floater 1.6kg.
| Total Contents | 1 |
|---|---|
| Benefits & Features | Kills germs. Kills algae; Clarifies; Sun protection; Lasts a month. Multi-function stabilised chlorinator |
How quickly does HTH shock work?
The fast-acting 4-in-1 shock product kills bacteria and algae, restores crystal clarity to pool water within 24 hours, reduces chlorine odor and eye irritation caused by swimming pool water, and won’t fade liners. It is convenient, easy to use and won’t over stabilize your pool.
What is HTH used for?
With a range of products & pack sizes to suit all pools and any plant room situation, hth® is widely used – from the smallest spa pool and water play feature, to large commercial rafting and kayaking complexes.
What is HTH® pool balancing?
hth® pool balance products fix pool issues such as cloudy water, pH fluctuation, and even metal buildup or cleaning filters. Along with testing, the first step in maintaining safe, clear water is using hth® pool balancing products in your pool water to prevent corrosion, equipment damage and scale buildup.
What do we do at HTH?
We have a range of products to clean, de-scale and disinfect pool and poolside surfaces, equipment and furniture. Behind an outstanding product is an outstanding back up team, we offer comprehensive support to all our hth ® public pool operators, distributors and approved installer companies.
How do you use the HTH pool care kit?
Use the HTH ® Pool Care Kit for closing your pool. Carefully follow label directions for order of addition and proper dosage of each product. Follow pool manufacturer’s directions on draining the pool so that water level is below the skimmers, and flush and drain any hoses that will remain outdoors during cold winter months
How do you use HTH pool stabilizer?
Adjust the TA, pH, FAC, and TH to the ideal levels recommended in the Balanced Pool Care Chart. If needed, stabilize the water using HTH ® Stabilizer. Shock treat pool water with an HTH ® shock product. Continue routine maintenance for the entire season to keep your pool water clear and clean.
