Staff Answer
Aug 24, 2026 - 07:50 AM
The CircuPool® UL40 Replacement Cell is the correct option to choose if you have an older Si-40 / Si-45 cell, as noted on the Si cell page. This applies to all UL cells, being direct replacements for older Si cells. It will be a plug-and-play replacement, allowing you to easily restore your original system's chlorination if your old cell is depleted.
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