Method 1:
1. If it is inconvenient to remove the vacuum tube, you can open the water inlet of the solar water heater and pour white vinegar into the water storage tank.
2. Let the water heater circulate automatically for 20-30 minutes to completely contact all parts with white vinegar, then open the drain outlet and drain the white vinegar that cleaned the scale.
3. Fill the water tank with water and circulate it again for 2 minutes, then drain the circulating water.