you must use an ultraviolet-specific amplifier from the 7800 series

In a low water condition

it provides active downstream pressure venting

eliminating the mechanical failure points and sediment buildup common in traditional float-style devices

Grundfos 97523134 Pump 318423-701 you must use an ultraviolet-specificThe Grundfos 97523134, also identified as the UPS50 60F, is a high performance three speed circulator pump engineered for demanding hydronic heating, cooling, and district heating systems. This wet rotor circulator features a cast iron pump housing and a canned rotor design, where the motor and pump form an integral unit without a mechanical shaft seal. By utilizing the pumped liquid for bearing lubrication, this unit ensures quiet, maintenance free