Sanitizing systems for in-ground pools

The water flows through a dosing unit that slowly melts the solid chlorine and injects it into the return circuit. The flow rate is adjusted by a small adjustable valve.

• Trichlor tablets/sticks (stabilized chlorine) only, designed for chlorinator or floating dispenser.
  
• Never use: calcium-hypochlorite-based chlorine (risk of a violent reaction) or a mixture of chlorine types. Never mix products in the same appliance.

Always keep a minimum number of tablets in the chamber; adjust the valve to maintain 1–3 ppm free chlorine.

Check O-rings, cover, off-line tubing (cracks) and check valve.

Rinse the inside if there are deposits (turn off the pump; handle with gloves).

• Seals & tubes: every 1–2 years (or as soon as cracks/leaks appear).
  
• Non-return valve: annual if exposed to concentrated chlorine.
  
• Lid: to be replaced if it turns white/cracks (loss of sealing).

Drain the water, open the dispenser (lid removed), disassemble the off-line tubes and store in a dry place.

Salt (NaCl) is dissolved in the pool (usually 1200-1800 or 2800-3400 ppm).

The electrolytic cell transforms salt into free chlorine, which disinfects the water, then reverts back to salt. The generation percentage is easily controlled with the small dial.

• Aim for the manufacturer's recommendation (often 3,000–3,200 ppm).
• Quick calculation:
  
  kg of salt ≈ Volume (m³) × (ppm to add) / 1000.
  
  Example: 50 m³, target 3,000 ppm, current water 500 ppm → delta 2,500 ppm → 50 × 2,500 / 1,000 = 125 kg of salt.
• Add in portions, circulate for 24 hours, then test again.

• Maintain pH 7.2–7.6, TA 80–120 ppm, free chlorine 1–3 ppm, stabilizer (CYA) 30–50 ppm.
  
• Cell cleaning: If a "Low Flow/Check Cell" alarm appears or production drops, briefly soak the cell in a mild acidic solution and rinse thoroughly. Avoid prolonged acid baths (which can cause plate wear).
  
• Monitor the flow rate (clean pre-filter, unclogged filter).

Cell: typically 5–7 years (depending on use, chemistry, acid cleaning).

Detector/flow switch: 3–5 years.

Lower/drain according to the closing procedure, remove/drain the cell (or drain plugs), disconnect the power supply, store in a dry place.

After adding salt / cleaning the cell

Run the filter pump for 24 hours to allow the salt to distribute evenly… The salt level display may take up to 24 hours to update.

Allow approximately 24 hours for the salt to circulate and homogenize; the average salt display may take approximately 24 hours to update.

Update the “average salt” with the “instant salinity”

Set the main switch to Auto, then press Diagnostic until you see “-xxxx ppm” (Instant Salt).

When Instant Salt is displayed, switch the main switch from Auto to Super Chlorinate, then back to Auto.

The ozonator (UV or corona discharge) injects O₃ into the circuit. The ozone rapidly oxidizes contaminants (creams, sweat, chloramines), reducing the demand for chlorine/bromine.

No. Ozone has a very short lifespan in water and does not provide residual disinfectant. You must maintain a low residual chlorine (1–3 ppm) or bromine (3–5 ppm) level for continuous safety.

Cell: 3–5 years on average.

Green hose: replace every year