What are strata dads and how to use them
DESCRIPTION
A stratified bed is an ion exchange unit that contains a layer of weakly acidic (or weakly basic) ion exchange resin on top of its strongly acidic (or strongly basic) counterpart. Service flow is downward and regeneration flow is generally upward, such that most stratabeds are countercurrently regenerated.
As with any other design that uses upflow regeneration, some means of keeping the resin bed from fluidizing during regeneration is required. Stratabeds require specially screened resins to prevent the weak and strong portions from mixing.
USES
Stratabeds are a means of using weak and strong resins in concert to improve chemical efficiency, less expensive than designs which keep the two kinds of resin separated in their own tanks.
Stratabed cations are effective when the raw water contains a high percentage of hardness and alkalinity. Stratabed anions are effective when the raw water contains a high percentage of chlorides and sulfates.
Stratabeds are generally used when the highest possible chemical efficiency is required.