What is the best way to clean CircuPool Universal40 cell?

Inspect the cell. If there is no visible toothpaste like buildup, put it back into service.

If there is any buildup, first get as much of it as you can with something long, thin and non metal. Wooden BBQ skewers, popsicle sticks, the handle of a plastic spoon, or zip ties have worked for many.

Use vinegar if there is any build up after that. Use a diluted Muriatic acid as a last resort.
 
Read SWG How It Works - Further Reading

You should only clean a SWG cell if it has visible scale on the plates.

Try and clean with the process that will do the least damage to the rare metal plates and then move to more aggressive methods if necessary.
 
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