Filbur Rectangular Diatomaceous Earth [DE] Grid [18" x 19-1/4"] [Center Port] (FC-9850) topsideparts Flow switches like this are

Flow switches like this are useful where system protection depends on confirming that water is moving before operation continues

You are not changing how the spa operates

There is no need to replace the entire topside if the internal electronics are still responding correctly

Single-speed circulation pump rated at 0

Filbur Rectangular Diatomaceous Earth [DE] Grid [18" x 19-1/4"] [Center Port] (FC-9850) topsideparts Flow switches like this areA rectangular DE grid helps provide the filtration surface needed inside a compatible diatomaceous earth filter, and this Filbur FC 9850 grid is designed in an 18 inch by 19 1 4 inch format with a center port for matching applications. When a grid becomes damaged, worn, or less effective, the filter can lose the dependable support it should provide during operation. The 18 inch by 19 1 4 inch dimensions, center port layout, and FC 9850 reference give