Posted: Sun Apr 09, 2006 11:57 pm
I have a similar pond filter and it works great. It works even much better than I ever imagined. The aquarium holds about 80 gallons.
You must not use a big 100+Watts pump ofcourse, just connect it to a canister filter.
Before I had this filter I was using an Eheim 2213 canister filter (one of the smaller canister filters, only 8W pump).
The problem was with cleaning the filter. You can't clean the entire filter at once because the beneficial bacteria will then be removed which results in cloudy water. Week 1 I cleaned the top half of the filter, week 2 the bottom half. Since the turtle makes such a mess it was sometimes necessary to clean the entire filter which resulted in cloudy water occasionally.
So, I had to get a bigger filter. After reading a lot about filtration and bacteria I thought it was a good idea to get a pond filter.
Since the filter is so big I am sure that I never need another one. Another advantage is that you can just buy another pump when you need more water to flow through the filter (bigger aquarium/pond, more turtles), no need to mess with the filter. Since the pond filter is connected to the canister filter no junk is getting into the pond filter.
Bacteria always remain in the pond filter so there is no problem in cleaning out the entire canister filter, I don't have to be careful with the canister filter anymore to preserve the bacteria.
I have not seen any bacteria bloom (cloudy water) in years. In the beginning I cleaned the pond filter after a few months and then (because it was not dirty) after about 8 months, then after 1.5 years and now I know that I won't open it for years. There is no real dirt in the filter, just some slimy stuff that probably are the bacteria. It looks very different from the junk inside the canister filter.
Note that there is about as much slimy stuff after 2 months as after 1.5 years, it does not seem to increase.
I never expected the pond filter to work so well with only a relative tiny amount of water (= not much oxygen for the bacteria to break down the dirt) flowing through it. The Eheim filter pumps only 100 gallons per hour but it is enough.
In the Eheim filter there are only two sponges/foam parts (coarse and fine). It is easy to rinse these, much less work than cleaning the porous rock pieces that I used in the Eheim filter before I had the pond filter.
I have stopped measuring water quality since right before a water change the ammonium and nitrite levels are too low to be measured and the nitrate level is minimal.
Note that the filter in the the first post is not meant to be under pressure. That means you can't put the aquarium on a table and the filter below the table. I tried it, but the lid of the filter broke after a couple of months due to the pressure. I had already reinforced the lid but it did not help. There are pond filters that can be pressurized.
The size of the filter and the fact that it can't be hidden below the table are probably the only downsides of the pond filter.
I am really happy with the water quality and the amount of work it saves (just clean it once every couple of years, this is ofcourse only true for the pond filter, not for the canister filter) and it costed about as much as a big canister filter.