When the salt in the water softener runs out, it can cause long-term damage and injury to your water fixtures. It may even cause the tank to overflow. Although this is the most prevalent application, water softening salts are employed in a variety of settings, from homes to industry. In the home setting, if you use a brine system instead of a liquid system, then you will need to replace the salt each time you replenish the water in your tanks. This is because once the salt reaches its maximum capacity, any additional bags of salt would be useless. Of course, you could always buy more containers of salt - but that's not very efficient. Instead, we recommend replacing the salt when you replenish the water in your tanks. If you use a liquid system instead, then you only need to replace the salt when you replenish your water supply. This is because the liquid form of the product contains exactly as much salt as needed for your household requirements. You would then simply add more liquid softener during replenishment visits to your local water supplier. Either way, it's important to maintain a regular schedule of water replenishment so as not to expose your residents or employees to unsafe levels of hardness. If your water isn't changed regularly, some areas might get hard enough for pipes to break under the stress. This can lead to expensive repairs or even loss of service until the problem is found and fixed!