Join Date: Jul 2003
Location: Charlotte, NC, USA.
My thought would be to have the peristaltic pump and an air pump come on at the same time (via timer). The air stone will mix up the solution in a few seconds and the peristaltic pump would get homogenous solution after the first few seconds. If it's on for more than a few minutes, the first little bit sucked up wouldn't be a big deal.
Is there a problem with N, P, K and micro nutrients doing funny things together and oxidizing? I am planning on using Greg Watson style nutrients (basic PMDD stuff).