@Springer89 The rule of thumb is to take your size grow pot (in gallons) and double that number. So if you're in a 3-gallon pot, run 6 gallons of water through the medium. Also, use a PPM meter to check the runoff PPM to ensure you're in the proper range. If you get your plant back to where it needs to be before flowering then it shouldn't effect the buds.
Got a pic?