When Your Brine Tank Is Full of Water, Here's What to Do If you're dealing with a brine tank full of water how to fix it comes down to identifying which part of the regeneration process has failed. Here's a quick overview: Quick Fix Summary: Check for a salt bridge - tap the salt surface with a broom handle; if it's hollow underneath, break it up Inspect the float valve - if stuck in the raised position, it keeps filling the tank without stopping Clean the injector/venturi -