As long as you keep your res temps low, your aeration (and thus dissolved oxygen) high, and the plants seem happy I wouldn't worry about whether or not you've completely eradicated the root rot. I've brought in perfectly good harvests with root systems that still had the remnants of a bout with pythium. It's a battle, and as long as the plants are winning it easily it's not too big a concern.

Just sterilize extra good between grows to make sure it doesn't kill the next crop before it can get strong.

Of course if you've still got the gremlin in your root system you need to keep an extra-close eye on it, and the effort your plants spend fighting it can slightly reduce your yield, but imo it's not worth losing sleep over if things are going well.

I don't think hygrozyme is much good for sterilizing. what ? .................... hydrogen peroxide wont "fix" root rot!!!! hydroguard and hydrozyme are great and hydroguard adds a helpful bacteria subtillis bacillus which eats all rotten roots something hydrogen peroxide cant do and i have always had temps 70 degrees or more in my res

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Some will some won't so what grow pot

I don't know what you're smoking, but it's an interesting kind of home-grown to be sure.

Hydrogen peroxide absolutely does kill root rot. Root rot is caused by one of a few different kinds of fungus. High levels of oxygen kills fungus (and most everything else). Hydrogen peroxide is an unstable molecule that's just itching to get rid of the extra oxygen atom it carries so it can become ordinary, stable water. That's what the bubbles are - pure O2.

However, an enzymatic agent like Sensizym is preferable to hydrogen peroxide since you don't have to worry about doing damage to your plants with high H2O2 doses.

But the reason that people use peroxide to combat root rot is simple. It works.