I've been doing this for almost a year now and it works great.
As the OP stated mix 1 gram of shock with 1 gal of tap or distilled water to make your solution, store in a dark & airtight container. I fill the old Clear Rez bottle with some of it and leave the rest in a gallon tupperware thing with an old shirt wrapped around it to keep the light out. I add about 50ml of that solution to my 2.5 gal rez every 4 days or so. Don't overdo it, it can kill the emerging roots. I have 2 cloners and the gallon mixture lasts months. I also used to fight slime, etc constantly, now I never see anything like that and I've gone as long as 45 days without changing the res water.
Super cheap and super effective.
As the OP stated mix 1 gram of shock with 1 gal of tap or distilled water to make your solution, store in a dark & airtight container. I fill the old Clear Rez bottle with some of it and leave the rest in a gallon tupperware thing with an old shirt wrapped around it to keep the light out. I add about 50ml of that solution to my 2.5 gal rez every 4 days or so. Don't overdo it, it can kill the emerging roots. I have 2 cloners and the gallon mixture lasts months. I also used to fight slime, etc constantly, now I never see anything like that and I've gone as long as 45 days without changing the res water.
Super cheap and super effective.