Water treatment and analysis

Cloudy water despite adequate disinfectant levels is caused by microscopic particles in suspension that the filter bed cannot retain. To restore crystal-clear water, you need to apply a concentrated coagulant or clarifier that clumps these colloidal solids together, increasing their volume.

The technical procedure requires distributing the product evenly around the pool's perimeter with the filtration system off, allowing the matter to settle for eight hours. Then vacuum the sediment directly to the drain without passing it through the filter, and backwash the sand or glass media to restore optimal flow in the hydraulic system.

The digital photometer provides a quantitative optical measurement of light absorption, eliminating the subjective visual interpretation of color scales on test strips. While test strips can have a 25% margin of error due to chemical degradation caused by ambient humidity, photometry provides precise decimal readings in milligrams per liter.

For precise testing of free chlorine, pH, and stabilizer, the Scuba II Pool Photometer uses fast-dissolving DPD1 and Phenol Red reagents in sealed tablets, ensuring consistent results and verified calibration for every test.

A pungent odor and eye irritation indicate an excessive buildup of chloramines, or combined chlorine, not an excess of free disinfectant. This condition occurs when active chlorine reacts with nitrogen-containing organic matter introduced by swimmers.

To correct this chemical imbalance at its source, follow these corrective shock treatment steps:

• Check and adjust the pH to the strict range of 7.2 to 7.6 using a chemical pH reducer or increaser.
• Perform a rapid shock superchlorination by raising the chlorine level to 10 ppm to oxidize combined compounds.
• Keep the motor running continuously for at least 12 hours.
• Perform a photometric check before swimming to verify that free residual chlorine has fallen below 2.0 ppm.

A professional physicochemical monitoring kit for bathing water analyzes four key factors to certify the pool water's safety and balance:

• Hydrogen potential (pH): must remain strictly between 7.2 and 7.6 to prevent damage to the eyes and pumps.
• Free residual chlorine: the therapeutic level must remain between 0.5 and 2.0 ppm to deactivate bacteria.
• Cyanuric acid (CYA): acts as sunscreen for chlorine, with a recommended range of 20 to 40 ppm.
• Total alkalinity: should be between 80 and 120 ppm to buffer sudden pH fluctuations.

The technical choice depends on the required degree of autonomy and the type of chemical product dosed in the installation. A mechanical erosion chlorinator passively dissolves tablets according to the water flow, requiring periodic manual refilling and continuous adjustment of its manual valve.

By contrast, installing a Tekna AKS 603 Standard NHP Dosing Pump allows liquid biocide to be injected directly into the return pipe with programmable, millimeter-precise flow control. This electronic automation eliminates handling concentrated chlorine, stabilizes levels at 1.0 ppm, and avoids unnecessary chemical overconsumption.

A cyanuric acid level above 50 ppm causes irreversible binding of the free chlorine in the pool, completely eliminating its bactericidal and disinfecting effect. This physical phenomenon occurs through the continued use of stabilized trichlor or dichlor tablets, which release cyanuric acid that never evaporates or decomposes in solar heat.

When analytical tests confirm concentrations above 70 or 80 ppm, chemical disinfectants lose their effectiveness and bacteria proliferate freely. The only viable technical solution is to replace between 30% and 50% of the water with clean water containing no stabilizing additives.

Dark deposits localized in ceramic joints are colonies of black algae, protected by a multicellular hydrophobic membrane that resists ordinary chlorine. To eradicate them, apply a deep-penetrating descaling polymeric algaecide formulated to chelate the metal and break down this protective wall.

The effective technical treatment is carried out by pouring a product such as Algiblack, removes black and brown algae 1 L. directly onto the stains with circulation turned off to maximize active contact. Brush vigorously with metal bristles after 4 hours to dissolve the root and restore the coating’s chemical sterility.