There are EGO3 filters for all Whirlpool brands.
There are two basic systems:
1 - Toploader: Your previous filter is mounted in a shaft (with or without thread)
2 - Standard assembly: Your filter is simply freestanding screwed.
"For variant 1, the EGO3 hot tub filter model Toploader always fits, no matter how long or short your previous filter was. Whether it has a thread at the bottom, a bayonet closure, or just an opening. Regardless of whether the diameter is smaller. The EGO3 Toploader filter always fits."
For variant 2, you only need to measure the thread diameter, whether it is a 2-inch or 1 3/4-inch thread diameter. And check whether you have a coarse or fine thread. These 4 combinations exist.
Measure and select the right hot tub filter type in the shop.