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Chlorinated products for swimming pools


Preguntas frecuentes sobre Chlorinated products for swimming pools

What is the difference between shock chlorine and slow-dissolving chlorine?

Shock chlorine and slow-dissolving chlorine differ in their dissolution rate and active chemical concentration. Shock chlorine, usually formulated with granular dichlor containing 55% or 60% available chlorine, dissolves in minutes to immediately raise the oxidizing level after storms, heavy use, or visible algae growth. In contrast, slow-dissolving chlorine consists of compressed trichloroisocyanuric acid in high-density tablets that release biocide evenly over 7 to 10 days to maintain routine disinfection.

I have a liner pool and the water is starting to turn cloudy. Which chlorinated products can I use without staining the bottom?

Chlorine tablets must never be placed in direct contact with the bottom of a liner pool. The localized concentration of trichloroisocyanuric acid irreversibly discolors and stiffens the PVC liner within hours. To safely disinfect this type of lining, apply the biocide using one of these two proven methods:

  • Compact tablets placed in the skimmer basket with the pump running, or using a Starpool 2.5 kg chlorine tablet dispenser. installed in the return pipe.
  • Granular shock chlorine, dissolved beforehand in a bucket of water and then poured evenly around the pool perimeter.
  • Floating dispensers that prevent residue from settling in areas with low circulation.

Which chemical parameters should be monitored when using chlorinated products?

The disinfecting performance of chlorinated products depends strictly on the balance of three chemical variables in the water:

  • Water pH: It must be kept strictly between 7.2 and 7.6. A pH above 7.8 deactivates more than 60% of the available chlorine's oxidizing power.
  • Residual free chlorine: The safe operating range is 0.5 to 1.5 ppm (mg/L) to destroy bacteria without irritating mucous membranes.
  • Cyanuric acid (stabilizer): Its ideal concentration ranges from 30 to 50 ppm. If it exceeds 75 ppm, over-stabilization or chlorine lock occurs, requiring some of the water to be replaced to restore its disinfecting ability.

I’ll be away for several weeks in summer 2026. How much tablet chlorine do I need to keep a 50 m3 pool clean?

A 50 m3 pool typically requires 2 to 3 250 g tablets of slow-release chlorine per week during the 2026 summer season. A multifunction product such as Quimiclor PS 5 Efectos Quimicamp 5 kg – 250 g Tablets (Multi-action Chlorine) combines disinfectant, algaecide, flocculant, stabilizer, and scale inhibitor in a single tablet, simplifying continuous dosing during periods of absence. Before leaving, adjust the pH to 7.2, carry out a light preventative chlorination, and set the filtration cycle to run for at least 6 to 8 hours a day during the hours of peak sunlight to ensure the product is evenly distributed throughout the pool.

Why does the water smell strongly of chlorine but remain cloudy?

The strong chemical smell is not caused by excess active chlorine, but by the massive presence of chloramines, or combined chlorine. These molecules form when free chlorine reacts with organic matter, sweat, and urea without destroying them, due to insufficient oxidizing power. When chloramines exceed 0.5 ppm, they cause eye redness and a pungent smell while the water loses its sparkle. To solve this problem, you must perform a shock chlorination by multiplying the recorded combined chlorine concentration by ten, which will chemically break the molecular bonds and restore the water’s clarity.

I manage maintenance for a homeowners' association and need enough stock for the whole season. Is it worth buying multipacks of chlorine?

Buying multipacks significantly reduces the unit cost per kilo of product and ensures you have chemicals on hand in case of unexpected weather in 2026. Options such as the Pack of 2 buckets of 5-action chlorine tablets, 5 kg each provide 10 kg net of stabilized tablets, protected in sealed plastic buckets with approved safety closures. To preserve the effectiveness of the chlorine compound for months, store the containers in a dry, ventilated place protected from direct sunlight, and avoid placing them next to pH reducers or acidic products that could release toxic gases.

How do you choose between pure chlorine tablets and multi-action tablets?

The choice between pure trichlor chlorine and multi-action tablets depends on the type of filtration system and the pool's supplementary treatment:

  • Pure chlorine (90% trichlor): Suitable for facilities with diatomaceous earth or cartridge filters, and for those who prefer to dose algaecides and flocculants separately based on precise, regular analyses.
  • Multi-action tablets (4 or 5 effects): Recommended for residential pools with sand or glass filters, as they combine disinfection, ongoing anti-algae action, and microflocculation in a single weekly dose, reducing the time spent handling chemicals.

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