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Reef Chemistry Question of the Day #86
The last stage of an RO/DI system consists of the deionizing resin. All systems actually have two resins, either mixed together or separate (to allow recharging). One of the resins binds ions with a positive charge and the other binds ions with a negative charge.
Suppose you had the bright idea that most of what you actually want to remove has a negative charge, such as nitrate, phosphate, and silicate, and to save money, you'll only use the resin designed to bind the negatively charged ions.
What would happen to the effluent pH (not the tank pH) if you only used the resin designed to bind negatively charge ions?
A. It would be higher than before the DI
C. It would be lower than before the DI
D. It would be about the same as before the DI
E. It could be higher or lower than before the DI, depending on what is in the source water
Good luck!
.
The last stage of an RO/DI system consists of the deionizing resin. All systems actually have two resins, either mixed together or separate (to allow recharging). One of the resins binds ions with a positive charge and the other binds ions with a negative charge.
Suppose you had the bright idea that most of what you actually want to remove has a negative charge, such as nitrate, phosphate, and silicate, and to save money, you'll only use the resin designed to bind the negatively charged ions.
What would happen to the effluent pH (not the tank pH) if you only used the resin designed to bind negatively charge ions?
A. It would be higher than before the DI
C. It would be lower than before the DI
D. It would be about the same as before the DI
E. It could be higher or lower than before the DI, depending on what is in the source water
Good luck!
.
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