How to clean the filter element of rifeng pipe floor heating?

Step 1: Close the main water inlet valve and water outlet valve, then insert the pipe for drainage into the water outlet and exhaust valve, then open the water outlet and exhaust valve to release the pressure in the geothermal pipeline, then open the filter valve with a wrench, take it down and clean it carefully, and finally restore it to its original state. The next step is to discharge the sewage in the geothermal pipeline: step one, close the main backwater valve, open the main intake valve, then close the small valves of each branch pipe, then insert the waterproof pipe into the backwater vent valve, and finally open the small valves of each branch pipe one by one to drain water one by one until the sewage disappears.