If you want those bubbles in your bubble wall to keep bubbling perfectly, you need to put in some effort and maintain the entire assembly. Regular maintenance can avoid major problems in the system. In order to keep the bubble wall functioning optimally, you need to run the air pump continuously. Except when you change water or clean the pipes, the air pump should keep pumping all the time. If the pump needs to be switched off for several hours or days, make sure that you drain out all the water. For best results, you should use only distilled water in bubble walls. Normal filtered water contains minor amounts of salt deposits that line the walls of the thin pipes. So, the effect of bubbles reduces drastically. Moreover, once salt deposits on the walls, it is very difficult to get rid of it. You should also protect the assembly from algae formation. Add a couple of caps of bleaching powder to the water when you change it. Bleaching powder gets rid of bacteria as well. For cleaning the air pump, and draining and refilling water, read the instruction manual provided by the manufacturer and follow precise steps. Maintaining cleanliness of bubble walls is crucially important.