Even in that post you have mixed terminology. Chemi-Pure Blue and Chemi-Pure are 2 different products.
My understanding is that Chemi-Pure (now know as Chemi-Pure original) is effectively akin to carbon. Chemi-Pure Blue is akin to carbon and Purigen. Chemi-Pure Elite is akin to carbon and GFO. Chemi-Pure Green is for freshwater tanks (I’m not sure of the exact composition).
So, if your original question was in relation to Chemi-Pure Blue vs Carbon, then the difference is the phosphate adsorption resin.
I believe that the different rates at which the carbon and phosphate adsorption resin get used up is why some people prefer to stick to separate carbon and Purigen, rather than going with Chemi-Pure Blue.
My understanding is that Chemi-Pure (now know as Chemi-Pure original) is effectively akin to carbon. Chemi-Pure Blue is akin to carbon and Purigen. Chemi-Pure Elite is akin to carbon and GFO. Chemi-Pure Green is for freshwater tanks (I’m not sure of the exact composition).
So, if your original question was in relation to Chemi-Pure Blue vs Carbon, then the difference is the phosphate adsorption resin.
I believe that the different rates at which the carbon and phosphate adsorption resin get used up is why some people prefer to stick to separate carbon and Purigen, rather than going with Chemi-Pure Blue.