Cillit uses a piston or rotary disc valve with position feedback.

// Step 5: Refill brine tank move_valve_to(BRINE_REFILL); delay_minutes(12); // depending on salt amount needed

| Menu | Parameter | Range | Default | |-------|-----------|-------|---------| | P01 | Water hardness (°dH) | 5 - 40 | 20 | | P02 | Number of persons | 1 - 10 | 4 | | P03 | Regeneration interval (days max) | 1 - 30 | 7 | | P04 | Regeneration time (hour) | 0 - 23 | 2 | | P05 | Salt type (NaCl / KCl) | 0/1 | 0 | | P06 | Flow meter unit (pulses/L) | 100 - 1000 | 450 |

void save_installer_settings() eeprom_write(ADDR_HARDNESS, new_hardness); eeprom_write(ADDR_PERSONS, new_persons); // Recalculate capacity_total based on persons and hardness capacity_total = new_persons * 70 * new_hardness; // 70L/person/day estimate

// Step 6: Return to service move_valve_to(SERVICE);

// 4. Check if it's time to regenerate (if scheduled and within time window) if (regeneration_pending && current_hour == regeneration_time_hour) execute_regeneration_cycle(); regeneration_pending = false; total_flow_m3 = 0.0; // reset consumption meter

// 3. Decide if regeneration needed if ( (capacity_total - consumed) < (capacity_total * 0.15) ) // less than 15% capacity left schedule_regeneration();