I am currently using both brands so ill give you my thoughts on the two. If you are farmiliar with hydor they come in "regular" or "pro". Deep blue brand is in between the both of the hydors for fineness of the sponge itself. I actually prefer the deep blue over the regular hydor. Best to last in order would be 1. Hydor pro, 2. Deep blue 3. Reg. Hydor. The reg hydor sponges break down quicker in my experience with cleaning them so yea the deep blue ones are actually pretty good ive had a couple last for 3 years so far with no detioration.
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