Air is extremely harmful in a brine system. It will promote an aggressive rate of corrosion, causes cavitation in the pumps, and can displace brine to the extent that the brine will overflow down the drain.
Cracked or broken brine lines can be detected by a loss of brine in the balance tank or by a visual sighting of brine on the arena floor or in the header trench. The leaks must be located and repaired to ensure the brine system stays full.
A good way to determine if you have air in your brine system is by observing your balance tank.
Some general tips for brine system maintenance.
It is extremely important to keep your brine in a very clean condition. Dirty brine will shorten the life of the brine pump seals, impede heat transfer in the chiller, and restrict the flow of brine to the cooling floor grid.