Pentair Grid Locator Spider

The Grid Locator Spider acts as a guide to keep your filter grids perfectly aligned inside the tank. Proper alignment is critical because it prevents the grids from shifting, which ensures the filter operates at maximum efficiency and prevents internal damage.

No, this specific part (59000500) is designed exclusively for the Pentair FNS Plus series. It will not fit other Pentair filter models, so please verify your specific filter model number before purchasing.

You should inspect the spider if you notice your filter grids are leaning, touching each other, or if you have difficulty reassembling the filter after cleaning. If the plastic arms are cracked, brittle, or broken, the grid assembly will not stay centered, and the part should be replaced immediately.

It is a straightforward replacement. Once you have opened the filter tank and removed the grid assembly, the spider typically snaps or slides into place at the top of the grid manifold. No specialized tools are usually required.

No, the Grid Locator Spider is sold as a standalone component. If you are performing a full filter maintenance, you may want to inspect your manifold and grid hardware separately to see if those components also require replacement.