$249 per year covers one system, either a water softener or a reverse osmosis drinking water system.
$399 per year covers a home with both a softener and an RO system.
That includes the annual service visit, free system check-ups, 20% off service calls and parts, 20% off salt year-round, discounted filters and additives, and for softeners, free resin cleaner and two bags of salt.
The plan is prepaid by credit card and covers one household at one address. The annual visit is one per household. Plan discounts don't stack with other sale promotions, so on a salt sale weekend you get the better of the two rather than both. Salt discounts on delivery apply at a four-bag minimum. Prices shown exclude tax.