TH+ Pool Hardness Increaser Powder – 5 kg
iopool TH+ is a calcium chloride-based pool hardness increaser supplied in powder form. It is designed to raise total water hardness (TH) when testing shows that the level is too low.
The 5 kg bucket provides a supply of hardness increaser for corrective water treatments, with the amount used depending on the pool volume and measured water hardness.
What is TH+ used for, and when should you add it?
Total hardness reflects the concentration of dissolved calcium and magnesium in pool water. TH+ increases water hardness by adding calcium.
Use TH+ when a suitable water test identifies a hardness level below the recommended range for your pool. The correction should be considered alongside the water's pH and total alkalinity.
Water with insufficient mineral hardness may contribute to an unbalanced water condition. Excessively hard water, on the other hand, may encourage scale deposits on pool surfaces and equipment.
TH+, alkalinity increasers and pH increasers serve different purposes:
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TH+ raises water hardness.
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An alkalinity increaser raises total alkalinity, helping the water resist pH changes.
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A pH increaser raises the pH value.
For a more detailed explanation, read our guide to pool water alkalinity and hardness.
How much TH+ should you add to your pool?
What is the recommended dosage of TH+?
According to the product label, 110 g of TH+ per 10 m³ of water increases TH by 1 °f (one French degree of water hardness).
This is the manufacturer's reference dosage for the product. The unit °f refers to water hardness, not degrees Fahrenheit of temperature.
The required quantity depends on your pool's volume, its initial hardness and the correction needed. Always test the water before adding the product and check the result after treatment.
TH+ is intended for corrections based on actual water measurements, not automatic weekly dosing.
How to use TH+ hardness increaser
Follow the manual application method described on the product label:
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Measure your pool water hardness using a suitable test, such as iopool 6-in-1 test strips.
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Assess the required correction using the measured result, your pool volume and the manufacturer's dosage.
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Switch on your pool filtration system.
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Pour the powder directly into the water in front of the return jets, avoiding direct contact between concentrated product and pool surfaces.
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Check water hardness again using a test strip to assess the treatment result.
Always follow the instructions on the original product packaging and the treatment recommendations applicable to your pool.
TH+ 5 kg product specifications
| Feature | Details |
|---|---|
| Product | TH+ |
| Main function | Increases pool water hardness |
| Declared composition | Calcium chloride |
| Physical form | Powder |
| Packaging | 5 kg bucket |
| Documented application | Swimming pool water |
| Label dosage | 110 g / 10 m³ for +1 °f |
| Application method | In front of return jets, filtration running |
Safety precautions and storage
Warning: causes serious eye irritation.
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Keep out of reach of children.
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Read and follow the original label instructions before use.
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Avoid breathing dust and wash hands thoroughly after handling.
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Do not eat or drink while handling the product.
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Never allow the concentrated product to come into direct contact with vinyl liners, polyester finishes or painted surfaces.
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Always add the product to water, never water to the product.
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Store in its original, tightly closed packaging in a cool, dry place. Do not reuse the empty container.
In case of eye contact: rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do, then continue rinsing. Seek medical advice if irritation persists.
The safety data sheet is available upon request.
Check hardness with iopool
The iopool app can assist with pool maintenance using the information and water test results provided.
Water hardness requires a manual measurement. The iopool 6-in-1 test strips measure hardness alongside other water balance parameters such as pH and alkalinity.
EcO Start measures pH, oxidation-reduction potential (ORP) and water temperature, but does not directly measure water hardness.
Frequently asked questions
Is TH+ the same as an alkalinity increaser?
No. TH+ increases hardness through calcium addition, while an alkalinity increaser raises total alkalinity to help buffer pH changes. They address different water balance parameters. Explore the iopool pool treatment range for other correction products.
Should I add TH+ every week?
No regular weekly addition is specified. Use TH+ only when your water hardness measurement shows that a correction is needed.
Does TH+ directly increase pool pH?
Its intended function is to increase water hardness, not to act as a pH increaser. pH and alkalinity adjustments require treatments appropriate to those measurements.
Can I use this 5 kg TH+ product in a spa?
The supplied product label describes swimming pool use. Spa-specific dosing and application instructions have not been confirmed for this product, so suitability should be checked before use.