Irrigation systems - be it simple automated ones, or hydroponics - have to be taken care of. If not looked after properly, these could get stuck after a few cycles, leading to potential damage of your marijuana crops. To ensure the seamless flow of the nutritional solution, it is wise to clean it every now and then with a dedicated fluid.
You might also want to introduce some changes into your setup - either make it grower, or simply transfer it to another spot with different requirements. By buying additional bits and pieces you can adapt your existing irrigation system to new requirements. After some time you may also have to replace some parts of the whole system.
For do it yourselvers, a range of fittings, hoses, seals and controls is also available.