The PG2 measures water outlet pressure. The red zone indicates when the flow has slowed and if the filter needs replacement (ie a significant drop in pressure).
Good flow is important for sufficient water delivery to the boiler & groups in busy periods.
If your flow is slowing down before the filters expected life then additional sediment filtration can be added, reducing changeover frequency and costs.
Not only is the pressure gauge a quick and easy reference for your staff or service tech when onsite it is also a good way of problem solving over the phone with clients.
This gauge easily fits into the top of any NEP HEAD.