I accidentally bought HyperSorb before I thoroughly researched how it compares to Seachem Purigen. Well, the end result didn't disappoint. I honestly don't feel any difference between them. Of course, Seachem would have us believe that Purigen is far more efficient at doing the same; This encourages consumers to buy it instead of HyperSorb. I have no problem with that. I have used the 100ml bag in 3 different tanks: 29L, 20XH and 55 gallon. Within 2-3 days each aquarium became so clean and clear that I was tempted to drink the water (NO, I never did and never will). Besides, maybe I am; but compared to Purigen, HyperSorb improves water clarity slightly faster and appears to last longer before requiring regeneration. The cost isn't very different, so you end up with a choice between the two. Personally, I will continue to buy Purigen unless Hypersorb is discontinued and the price drops significantly.
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