In general, almost all synthetic nutrients are fine as long as you use PekAcid or Drip Clean (some of our customers believe you only need to use this if you’re over-fertilizing). Organic nutrients (even thick ones like molasses) are fine in small dilutions but become a problem if too much used. For thick concentrations, you can make a “Nutrient Well” which is just a hole filled with nutrients under the Blumat drip line. For thinner liquids, you can first fill the hole with vermiculite which acts like a sponge. This is basically making your own “Time-release fertilizer.”