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The Astral 18219RO100 R is a compatible replacement for the following spa filters:
The Astral-Terra 18219RO100 Comp Pool Filter Cartridge purifies swimming pool and spa water through the use of 75 square feet of media. This compatible Astral filter measures 8 15/16" x 14 3/4" with 3 3/4" Open top & bottom holes.