Cleaning out hydroponic system

[lynz34]

For a year, I have been growing poblano chillis hydroponically. They have performed brilliantly and have produced a healthy continual harvest, which is great!!

I really want to clean out my growtent and the system, which is the ChilliGrow I bought from Greenhouse Sensation. About 6-7 weeks ago, I realized there was something in the water (something white, about 2mm long), as well as the roots from my plants.

My questions are before I start this process - what should I use to be cleaning out the water reservoir to ensure these things are dead? I don't want to affect my plants. Should I cut back the roots that have grown into the water reservoir? Again I don't want to affect them.

Any help would be much appreciated!!

[Aberdeenplotter]

First thing to do might be to check if they are alive or alternatively are just lumps of something precipitated.