The short answer
The 2510 passes more water and is fitted to larger tanks; the 5600 suits most single-family homes.
The difference
| 5600 / 5600SXT | 2510 / 2510SXT | |
|---|---|---|
| Typical use | Most homes | Larger homes and tanks, higher flow |
| Parts | Widely sold | Widely sold |
Softeners on each
5600SXT: AFWFilters Fleck 5600SXT 1.5 cu ft Water Softener, Fleck 5600SXT 48,000-Grain Water Softener and Filter System. 2510SXT: AFWFilters Iron Pro Fleck 2510SXT 48,000-Grain Water Softener and Filter System, Abundant Flow Water Systems Iron Pro Fleck 2510SXT 32,000-Grain Water Softener and Filter System.
Choosing
Size the softener to your load and flow first; the maker fits the head. Size it.
Products mentioned
Questions readers ask
Is the Fleck 2510 better than the 5600?
Not better, larger: it passes more flow and suits bigger tanks.
Can I put a 2510 head on my 5600 tank?
Only if the tank thread and distributor match and the injector suits the tank; check the maker's specs.