H202 works great in my hydro system.
I add it every time I change the nutes out and add extra to the top reservoir.
I know how much to put in and never overdo it.
It keeps the valves, nozzles and pumps clog free.
If I don't add it everything gets caked with bacteria and fungus.
It also makes my plants happier with it in there.
If you overdo it there will be yellow stripes in your leaves.