12-06-2011, 01:27 AM
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You could run a single 'bottom' sponge in the aquaclear and even then biological filtration isn't going to be overly effected. Running two AC sponges if they are the exact same is no more efficient at collecting particles then running a single sponge. Basically everything that can get caught will get caught in the first sponge. Only if the second sponge has a smaller pore size will it aid in removing debris. One thing that bothers me is aquaclear doesn't tell you the pore size of those sponges. However since I have some AC sponges in my Rena canister I'm fairly confident they are coarse sponges. Either the same or coarser then my coarsest sponge . I say this because they are in the 2nd filter block, after the initial sponges and ceramics. They don't catch crap where they are lol. The rena canister comes with 4 different sponges that in the end look EXACTLY the same. However there are actually 2 different types. 2 sponges have 20ppi(pores per inch) and the other 2 have 30ppi. The 20ppi is the very first filter media , directly followed by the 30ppi. All these get REALLY dirty.
The exact AC sponges I have are for an AC 20, there are 3 of them. To put in perspective the media capacity of a canister filter. All together they occupy less then 1/6 of the space inside my rena.
I agree with sanguinefox, all the whispers I have seen or had the unfortunate experience of preforming maintenance were pretty terrible filters. No staging so they clog easily, really low media capacity if they are used unmodified. The 'power filters' are junk IMO. Only use I've ever gotten out of whispers are their ugly 'in tank i series'. Unlike the other they have submersible pumps. When ever a used one of these ends up in my place it gets salvaged. Take it all apart, get the the pump out, rest can go in trash lol. That pump is essentially a powerhead, it even has the holes for suction cups on it. As long as it doesn't constantly seize up it can live a much better life free from the filter lol.