The A-750 Mineral Electrode Cell replacement is compatible on all ClearBlue Spa Ionizers and Pool Ionizers. (you must purchase a replacement cell with the same plug color for compatibility) ClearBlue mineral cells should be replaced every 2-3 years in hot tubs or every 1-3 years in pools. Cell life will depend on water volume and usage. The first cell will go quicker because the minerals need to ramp up in the water. This is especially true in larger pools. Once the minerals have built up, they are very stable, even over the winter. So subsequent cells will last longer.
