My system is very dirty, how do I clean it thoroughly?

Between crops, you need to give the whole system a good clean before starting a new cycle. Use FlashClean®.
If your system is particularly dirty, fill it with a very acidic solution (pH below 4.0) and let the system run for an hour. Then, rinse thoroughly. In the event of disease or insect attack, use a household disinfectant (chlorine) to clean the system well. Rinse and allow to stand for 24 hours so that the chlorine evaporates completely.