The short answer
Cabinets put the resin tank inside the salt tank to save space; two-tank systems separate them and usually take standard valves and parts.
Side by side
| Cabinet | Two-tank | |
|---|---|---|
| Footprint | One cabinet | Mineral tank beside a brine tank |
| Valve | Often the maker's own | Often Fleck or Clack |
| Parts | From that maker, by part number | Widely sold by valve family |
What to weigh
- Space in the utility area.
- Whether you'll service it yourself and can get parts by number.
- Capacity: two-tank systems come in larger sizes.
Examples
Two-tank units on Fleck heads: AFWFilters Fleck 5600SXT 1.5 cu ft Water Softener, Fleck 5600SXT 48,000-Grain Water Softener and Filter System. Parts for cabinet brands are in the valve parts lookup.
Products mentioned
Questions readers ask
Are cabinet water softeners worse?
Not by design; they trade capacity and parts choice for a smaller footprint.
Can I get parts for a cabinet softener?
Usually from that maker by part number; bypass valves and adapters are sold for many cabinet brands.