There is plenty of evidence, myself included, that hydroguard helps correct root rot. Here are just a few quotes of people who used HydroGuard for root rot. (there are a shit ton, just thought id post of few)
"Had an issue with root rot in a DWC caused by using limes as an emergency PH control. Was dang sure those roots were done, but 3 days after adding this they were healed. I'm talking new roots, healing of sick roots, explosive vegetative growth. I have no idea what these bacteria are doing, but it sure as hell works!"
"Love it, love it, love it, and so do my plants!! Use as directed and never see root rot again! I had a plant that had been inadvertently neglected, and developed a rather nasty case of root rot. I treated it with Hydroguard, and within 24hrs. the worst of the rot was gone, and the plant was showing signs of new root growth. A few days later I could hardly tell that there had been a problem. This stuff should be at the top of every hydroponic gardeners shopping list!"
"I bought this to address a soil root rot problem I was having and it cleared everything up. I use this in hydro, but I mix it into ferts for houseplants and the garden"
"reat stuff for root rot. For some reason every batch I've gotten from amazon is expired but they are always ready to help me out."
"My bottle is in its fifth month and still going strong. It got rid of a little root rot in one week, and now the roots smell perfect."
"Helped a lot with root rot!"
"Roots were in root rot stage and I thought my tammatoes were gonners, nope purchased hydroguard and my plants were producing healthy new root growth in a day. A great product must buy for any hydroponic growers beginners or pros."
"The best solution for root rot ever!, Your plants will love you for it! Creats huge healthy root mats in deep water culture"