I am using a pre mix loaded with perlite. the roots are turning brown, i know for sure they were suffocated.If you step step back a bit then you will see that you cannot over water. People use Sips and dutch buckets, Hempys and even float plants on a body of water. The problem that people associate with over watering is actually not enough O2 in the root zone. This why majority of soil growers use perlite in their soil mix, it traps air.