Just using one good flush should do the trick. Flush with ph corrected water about 5-10 times the amount of the container. i.e. if you have a 1 gallon pot then flush with five to ten gallons of water. This will remove any nutes that have been put in aswell as any salt build up. After you flush your plants, water with a very "LIGHT" nute solution then dont water for a couple of days. Hope this helps ya.