Rainwater harvesting systems have leaf filters to stop debris from entering the tank. The pumps used also have particle filters to prevent any particles entering the pump, however, the particle filters prior to a pump cannot be too restrictive as to prevent flow through the pump (0.5mm is a generally viewed as a good size mesh for a pre-pump filter).
Adding a particle filter to your rainwater harvesting system after the pump and in the property is an excellent way of ensuring the valves and appliances are completely protected against fine particles which could cause leaking valves. Particle filters can have a mesh of 0.01mm, which is also a requirement prior to any UV filter, used in the event that rainwater needs to be made potable (suitable for drinking)
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