it makes the root zone a bit colder.. Then depending on conditions.. The water warms up to normal levels... Cold water is better then hot water for sure.. But does it make a difference??? Not in my opinion.. I always use water right from the tap and because I am in the mountains it's some cold water.. I don't aerate my water. Plants actually use chlorine. And stoner science is nonsense science.. Science now a days is all about marketing as well. So be very careful when you read anything published by anyone.. Everyone everywhere is trying to self promote/sell you something. Happy growing! :) ha ha ha ha