yup dont use the bleach with your pumps, u can use bleach in your rez but dont run it through the lazer spray line.h202 will work and there are many other products that will do the same,u can buy regular peroxide and calculate how much u need.if u cant get your hands on any hydro specific brands.personally though i would dissasemble the whole system and cap off the ends of the tube and slosh bleach water up and down the tube,as well as the manifold.then run your h202 through the system.good luck friend