What is the harm, how to judge and how to supplement the lack of Pebble filling in the stone cooler?

After the cooling device runs for a period of time, the filling pebbles will gradually be compacted and sink due to the impact of air flow back and forth. In addition, the pebbles will be worn out or broken, which will also cause the quantity of pebbles to be insufficient. The filling of the Pebble is not tight, and the airflow drives the pebble to jump up and down, which is easy to smash the coil tube, which can be judged by the sound of hitting the tube wall. The deficiency of pebbles also affects the ability of heat storage. Therefore, timely supplement should be made.
Supplementary Pebble can be added from the Pebble supplement port on the upper part of the cooler without stopping. The filling port is equipped with sealing device to prevent air leakage and cold running during filling. Before filling, the pebbles should be cleaned to prevent weeds, sediment and other sundries from entering the cooler, affecting heat transfer and increasing resistance.