Over-chlorinating burns eyes, damages equipment, and wastes chemicals. Under-chlorinating breeds algae and creates a health risk. This guide gives you the exact dosage per m3 for both SDIC and TCCA, adjusted for real-world variables.
1. The Baseline Formula
Target free chlorine residual: 1.0-3.0 mg/L (ppm) at all times.
Baseline chlorine demand per m3 per day:
- Indoor pool, low use: 0.5 g active chlorine/m3/day
- Outdoor pool, low use: 1.5 g/m3/day
- Outdoor pool, heavy use (public, hotel): 3.0-5.0 g/m3/day
- Water park, wave pool: 8.0-12.0 g/m3/day
2. Converting to SDIC / TCCA Grams
Since SDIC is 60% and TCCA is 90% available chlorine:
| Application | Active Chlorine Needed | SDIC 60% dose | TCCA 90% dose |
|---|---|---|---|
| Indoor low use | 0.5 g/m3 | 0.83 g/m3 | 0.56 g/m3 |
| Outdoor residential | 1.5 g/m3 | 2.5 g/m3 | 1.67 g/m3 |
| Hotel/gym pool | 3.0 g/m3 | 5.0 g/m3 | 3.33 g/m3 |
| Water park | 10 g/m3 | 16.67 g/m3 | 11.11 g/m3 |
3. Seasonal Adjustment Multipliers
- Summer (water > 28°C): × 1.5 (heat accelerates chlorine consumption)
- UV-heavy days (peak sun): × 1.3 (cyanuric acid helps but not fully)
- Rainstorm event: + 20 g SDIC per 10 m3 for shock treatment
- After pool party: + 30 g SDIC per 10 m3 shock (with 2-hour circulation)
4. Shock Treatment Protocol
Shock the pool weekly using SDIC (fast-acting):
- Test current chlorine level (target: 5-10 mg/L for shock)
- Calculate: (10 – current) × pool volume in m3 = grams of chlorine needed
- Convert to SDIC: divide by 0.6 → grams of SDIC needed
- Dissolve in bucket first, then pour around pool perimeter
- Run circulation for 2 hours before swimming
- Test chlorine drops back to 1-3 mg/L before allowing swimmers
5. TCCA Slow-Release Dosing
Using 200g TCCA tablets in a floating dispenser:
| Pool Volume | Tablets Needed (weekly) | Notes |
|---|---|---|
| 15-25 m3 (residential) | 1 × 200g | Check after 5-7 days |
| 50 m3 | 2 × 200g | Rotate positioning |
| 100 m3 | 3-4 × 200g | Consider automatic chlorinator |
| 500 m3 (hotel) | Use automatic chlorinator | Feed rate 20-40g/hour |
6. Common Dosing Mistakes
- Adding tablets directly into skimmer basket — corrodes basket over time
- Mixing SDIC and TCCA in same tablet feeder — chemical incompatibility
- Dosing based on visible algae — too late, dose weekly not reactively
- Ignoring cyanuric acid level (should be 30-50 mg/L; > 100 mg/L blocks chlorine)
- Not calibrating test kits (DPD tablets expire in 12 months)
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