RODI set up ?

When running two carbon blocks does one really need to be smaller? I think my setup has a 5 and then a 1. Its was the orginal BRS 150 GPD water saver. Cause it looks like BRS changed that setup now to the same in each chamber.
 
hmmm, wonder if this could explain why my DI never lasts more than 6months. I just assumed it was the cheap bulk stuff i bought off ebay.

Is there a test for Chloramine, i could test before the RO and then before the DI?

Other than normal reef tank paranoia, id like to know what exactly is going on :) :)
Jinkies. I get 200-300 gallons MAYBEE of rodi water out of a DI fill. That's why I recharge my resin. Find it's more cost effective. Just finished recharging 2x1 gallon bags.

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