Standard test conditions (fully automatic operating conditions)

1. Water quality conditions (hard water simulation)

- Total hardness: 250±20 mg/L (CaCO₃), alkalinity: 140±20 mg/L

- pH: 7.0~7.5, conductivity: 1000±100 μS/cm, turbidity ≤1 NTU

2. Operating conditions (PLC fully automatic control)

- Flow rate: 2 L/min, single water intake volume: 5 L

- Heating temperature: 80±2℃, constant temperature maintenance: 8 hours per session

- Circulation mode: water intake → heating to maintain constant temperature → water drainage, lasting for 16 hours daily, for 21 consecutive days

3. Environmental conditions

- Inlet water temperature: 25±1℃, ambient temperature: 25±5℃

II. Core Test Content (6 Major Items)

1. Scale inhibition rate test (core indicator)

- Method: Calcium carbonate deposition comparison method (blank group vs experimental group)

- Determination: Scale inhibition rate ≥85% (GB/T 16632); ≥ nominal value (GB/T 30306)

- Detection: scaling amount of heating tube, calcium ion concentration, weight difference of scale

2. Release performance (dissolution rate) of Silicophosphate Crystal

- Monitoring: Effluent phosphate concentration (2~3 mg/L), TDS value changes

- Determination: Stable dissolution, no burst release, no discontinuous release, meeting the safety limits for drinking water

3. Dynamic cycle durability life

- Continuous flow: ≥500h, thermal cycling: 25℃↔80℃

- Assessment: structural integrity of filter element, loss rate of silicate phosphate crystal, and scale inhibition performance attenuation (≤10%)

4. Observation of scaling morphology on heating tubes

- Visualization: Observe the amount, thickness, and compactness of scale deposition through a high-temperature resistant glass window

- Comparison: Blank group (severe scaling) vs Experimental group (mild/no scaling)

5. Comprehensive monitoring of water quality parameters

- Real-time collection: pH, hardness, conductivity, turbidity, temperature, flow rate

- Record: ion concentration fluctuation, stability of scale inhibition components

6. Failure determination

- Excessive scaling, abnormal leaching, damaged filter element, sudden performance decline, and off-flavor in effluent

III. Functions of fully automatic equipment

- PLC program control, touch screen parameter setting, automatic water inlet/heating/drainage/circulation

- Automatic data collection, curve generation, automatic calculation of scale inhibition rate, and report export

- Multi-station parallel operation, precise control with constant temperature and current