Flushing done properly will help cure 90% of problems. Whoever gave you the idea you flush with plain water or plain distilled water or plain ro water is plain wrong. You flush with a 1/4 strength nute solution, at two times the capacity of the container. If you use plain water, it seems like the plants keep what they have, thinking they may not get anymore, BUT if you use a 1/4 strength nute solution they think they are going to get more and will give up what they have. Sometimes you can have a 'salt' build up, flushing will take care of that. Fact is the only problem it won't help cure is poor drainage and I personally quarentee that if you flush your plants like I described you will know if you have a drainage problem. VV