CTX-21 Alka+ – Alkalinity Increaser

CTX-21 Alka+ is a powdered alkalinity booster designed to correct and stabilize total alkalinity levels in pool water when they fall below 125 ppm. Essential for maintaining chemical balance, preventing pH fluctuations, and protecting pool equipment, Alka+ ensures clearer, healthier, and more comfortable water for swimmers.

Why adjust alkalinity?

Total alkalinity measures the amount of alkaline compounds dissolved in the water, such as carbonates, bicarbonates, and hydroxides. It acts as a natural buffer against sudden pH changes. When alkalinity is outside the ideal range of 125–150 ppm:

• pH fluctuates constantly;
• Chemical consumption increases;
• Water stability decreases;
• Corrosion or scale may occur;
• Bathing becomes uncomfortable (eye and skin irritation).

Benefits of CTX-21 Alka+

• Quickly corrects total alkalinity;
• Stabilizes pH and reduces constant fluctuations;
• Improves the effectiveness of other pool chemicals;
• Prevents corrosion and scaling;
• Increases swimmer safety and comfort;
• Suitable for all pool types.

Recommended Use

Recommended for residential and commercial pools, regardless of coating or filtration system.

How to use CTX-21 Alka+

1. Measure total alkalinity using test strips or a test kit.
2. If it is below 125 ppm, apply the product.
3. Recommended dosage: 1.8 kg to increase total alkalinity by 10 ppm per 100 m³ of water.
4. Pre-dissolve the product in a bucket of water.
5. Distribute the solution evenly over the pool surface with filtration running.
6. Keep the filtration system running for 6 to 8 hours and re-measure.

FAQ

What happens if alkalinity is too low?

pH becomes unstable, chemicals are less effective, and corrosion and irritation may occur.

Can I use CTX-21 Alka+ with other products?

Yes. It improves water stability and enhances the efficiency of chlorine, algaecides, and clarifiers.

Is it suitable for all pool types?

Yes, it is compatible with all surfaces and filtration systems.

How often should I check alkalinity?

Check weekly, especially during hot weather or heavy pool use.

Does this product change the pH?

It stabilizes pH indirectly; its main function is to adjust total alkalinity.