Filters for Spas & PoolsOur filter numbering system is based on the Outside Diameter of the filter cartridge. When locating your spa filter by size, start with this measurement.
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Copyright © 2010 US Spa Parts.
Filters for Spas & PoolsOur filter numbering system is based on the Outside Diameter of the filter cartridge. When locating your spa filter by size, start with this measurement.
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