What a brilliant response from you all Thanks just a couple of questions, I dont have a PPM/TDS tool would this be essential in your opinion I have a PH meter and make sure im in the right ph range, I will increase there feed amount to 1ltr per 10ltr pot this week and will PH test the run of, I shall purchase a ppm tool if it is absolutely necessary, Also my nutrients - Before posting I have bought some ph up and down and a PPM meter - If a jobs worth doing.....