Either one is good. If you’re doing it in the beginning with a virgin sample, it allows us to know how much your loading. If its already in the process, we can still figure out that information going forward. We just want to do it before we have problems because as we mentioned, we want to collect samples over this amount of time and we want to send it to the lab to get the best information possible. If we are already having problems, we are a little further behind, so getting in front of this allows us to provide a really good path for your organization to have the chemistry doing its optimal job.