Sterile is by no means the only way, is only a way that has worked for many. When done correctly h2o2 has the added benefit of converting to oxygen, adding more d.o. to the res. I wouldn't say it's the best way of growing but if all else fails..... also pool shock works well when done correctly. Beneficial Microbes don't always work especially if you catch the rot too late. Personally I would start with bennies and if that doesn't work, switch to sterile.