Catalytic carbon vs carbon blocks?

[silvernblackr35]

Any RODI gurus know whether it is more effective to substitute a catalytic carbon refillable canister in place of a standard carbon block for chloramines? I have 3.5ppm chloramines in my tap and have noticed my carbon blocks barely last 5-6 months before needing changed. I have 2 carbon blocks and was wondering if it would be better to substitute the first carbon block for a catalytic carbon canister. You don't see them around as much in our hobby rodi but I see them used quite a bit in drinking water applications.

Thanks in advance.

 

[Randy Holmes-Farley Verified Community Expert]

What are you using to decide when to replace the carbon block at 5-6 months?

 

[silvernblackr35]

What are you using to decide when to replace the carbon block at 5-6 months?

A handheld tds meter and chlorine strips.

 

[Randy Holmes-Farley Verified Community Expert]

So you begin to detect chlorine?

 

[silvernblackr35]

So you begin to detect chlorine?

At 6 months yes, at 5 months tds is up by 40-50 from what it originally was pre membrane.

I nearly crashed my tank waiting a year to change filters as recommended, now I don't mind being cautious.