This means for a full 4 month supply, you will need 1 blue mineral cartridge and about 4 silver SmartChlor cartridges.
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Product style and packaging may vary.
Special Note: Unfortunately, Individual Frog @ease SmartChlor cartridges for Jacuzzi Hot Tubs are not sold separately. We have requested that the Mineral cartridges (blue) be made available on an individual basis from the manufacturer, and if that becomes an option we will add that to our product listing, as soon as we are able.