I'm sorry you guys but I am stuck on those bloom nutes. When I mixed up the grow nutes the ph naturally went to 5.7...never had to adjust it before I put new stuff in. With the pro-bloom when I mix the ph stands at 4.6 until I adjust it up with baking soda before I add it to the rez. I am willing to swear to this in court, lol I have found this grow that the ph will drop a little the first day then start to go up slowly. I also could not keep my ph down with well water which is why I switched to RO.