eze bro,you have to remember that you have to change your nu supp every 5 to 7 days so work out your dose then you got your supply you av 2 buy.keep your ph between 5.2 and 6 and u in...u dose with part a then leave for 2 hours then add part 2.ph water before adding nutes.....let us no how you get on ...gman corby town uk