The new Bullfrog Spa cartridges are coreless. From 2017 models on, the cartridge will
require a re-usable core. The cartridge part only is Part #10-00281 for the STIL model.
There is also model 10-00282 for the A,R and X series spas. All are available at Waterwayparts.com
The cage core only is part # 10-00417
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