Filter-Max III Prefilter

We have breeding albino catfish in a 15 gallon show tank. This works perfect to save the tiny babies from being sucked up the filter. It also saves the frequent Whisper Biobag filters changes. I wish we knew about this many years ago!

As far as its size. It is large-about 4" long and nearly 2" diameter. You can install it vertically or horizontally, which is convenient. It's easy to put on intake tube with several adaptor connections. I planted a few artificial plants around to hide the filter. So far so good!

I bought this to keep baby guppies and cherry shrimp from getting sucked up into the uptake of a fairly powerful canister filter. It has worked very well so far, but it is not quite perfect.

I wish the adapter did not have two 90 degree bends in it. This is not great for fluid dynamics, and it also just seems unnecessary why can't you just put the sponge straight on the tube?

Another problem with the adapter is that it leaves small holes around the edge of where the adapter covers the center of the sponge. A wee baby guppy or a baby shrimp could get sucked up in those holes. It would be nice if it fit better.

I have had to rub the sides of the sponge once in a while to loosen up the debris and let the water pass better. Its not a big deal, and not a flaw in the sponge, but something to be aware of. You dont want to make your filter pump work any harder than it has to.

Overall, its a perfectly good pre-filter, and I am planning on buying another one soon.

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This pre-filter is a must if you raise fry or shrimp. I use them on a Aquaclear 70 and they do excellent both as a pre-filter and a guard to keep the shrimp from becoming pate. My only fuss is that the other model has a very fine sponge that failed after a couple of months. This one, with the course sponge, is great.

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Bought this for my aquaclear 30 when my molly had babies to avoid them from being sucked up the filter. IT worked perfectly, and you can see the bio crud that it traps! Might actually help the filter increase efficency also.

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I was hesitant to buy this but after connecting it to my old school whisper filter it works great. I wish they sold sponge filter separately to replace this large sponge. I will buy again if i cannot find replacement sponge.