I received a size 5 pad which says it will fit most filters. I'm sure it will fit most water filters, but I would caution anyone using an Aqueon Power filter that this pad is too large to fit properly. Mine didn't fit properly and the pillow actually ripped on one side. The gap wasn't very big, so I didn't think about it much, and I didn't lose many of the beads that make up the pillow, so I wasn't worried. Apart from this question, I have tried to implement everything that is in the instructions to the best of my knowledge and belief. Despite my efforts, which required some maneuvering to adjust the cushion, the cushion did not reduce the water hardness one bit. I have tested my water several times and was disappointed that the filter was not working properly. I'll try to reinstall the pillow and try again, but I confess my hopes aren't very high.
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