Sterile replacement for SM-90?

[Barney86]

Sup fellow stoners, I've just went to set my Res up after a break from hydro and realised that I've only got 2 weeks worth of sm-90 left and it's not for sale at the moment. Known for a while but forgot to sort it.
What's the next best thing that runs the Res sterile? I'd prefer not to have any sort of microbes growing there at all so don't fancy hydroguard.
Anyone care to enlighten me por favour

 

[Mr. Krip]

When I was running hydro, I loved and would swear by Dutch Masters Zone. I believe active ingredient is copper.

 

[Barney86]

When I was running hydro, I loved and would swear by Dutch Masters Zone. I believe active ingredient is copper.

Yaas mate, that s exactly what I'm looking for! Much apreacited, I'll get some ordered at the weekend and see how it goes.