I don’t water till water comes out the bottom I just water till soil appears wet.So my plants won’t harvest?
When you don't run water enough to come out the bottom, salts from the nutrients can start to accumulate causing high levels of nutrients and salts in concentrated areas of the soil. Running plenty of water will help to dissolve the excess salts in the growing medium. This is the goal of flushing... to remove excess nutrients. It is a balancing act between using enough and too much nutrients, and it is surprisingly easy to overdo it.
My advice, and this is mine only, is to water with plain water until water starts to come out of the bottom, then add a little more water. Let it drain out for a few hours or a day and then repeat the process, checking the runoff at the start and finish of flushing to verify you aren't having other issues and that excess nutrients and salts are eliminated.
In growing, a certain percentage of nutrients doesn't get used and is usually washed away in runoff, etc. Without a way to eliminate the excess nutrients, they build up and begin to cause toxicity and lockouts. If I grew in FFarms stuff (I use
Promix), I wouldn't feed anything for a few months, maybe the entire grow depending on how big my plants are. Less is better.