The water soluble minerals require replenishing every 8-9 months (with normal backwashing at 5% per month).
The FAQ does not indicate the lifespan with pools that do not require backwashing (such as with pools that use cartridge filters). Would it be right to assume that as long as no significant water is discharged or splashed then replenishing should not be necessary? (normal water loss through evaporation is ok, since the minerals will stay behind).
