Run your entire system through with some light bleach water for about 24 hours, then run straight water through it to rinse out the bleach (rinse well!!) Air your hydroton for about 24 hours and you should be good to go.

All males? Sounds like you are stressing them somehow....that's usually the reason you get more males than females.
Weedhound Reviewed by Weedhound on . Hydro maintenance between grows? Hi So my first hydro grow ended with all males and now I am starting a new one. What should I do with the hydroton? I removed old roots as much as I could, but theres a still a lot of small pieces of roots attached to the hydroton. Should I boil the hydroton or just flush it really good? Rating: 5