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post #1 of 5 Old 01-29-2010, 12:59 AM Thread Starter
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Canister filter

I have looked at a couple canister filters and their turnover rate (gph or whatever you called), and this one Ehiem Plus Series Filters, Eheim Canister Filters | Pet Solutions has 165 gph rated for up to 93 gallons. I think ive heard that a filter should be going through the water 4 times an hour, now if i get that for my 75g wouldnt i need 300gph? Or is it a different rule with canisters?

sorry, canisters are a new concept for me
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post #2 of 5 Old 01-29-2010, 02:40 AM
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Basically, there are two different philosophies for filtration: one that promotes high flow rate and one that promotes low flow rate. There are good arguments for both sides of the debate. Eheim basically builds their filters based on that second design philosophy. They generally have low flow rates and lots of space for media, which give the water lots of contact time with the media. For this reason, Eheim filters generally don't fit the standard flow rate calculations. It's always safe to be conservative for these kinds of things. Considering that using the "high flow rate" filtration philosophy, filter manufacturers recommend 5x turnover and I tend to go towards 10x per hour, I'd approach Eheim in the same way, but using their metric. So, if their filter was rated for 93 gallons, I'd probably think it's sufficient for half that.

More simply, if I were in your shoes and was going to heavily stock this tank, I'd probably get the next biggest size or, more likely, add a second filter. But I really like overfiltration.

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post #3 of 5 Old 01-29-2010, 02:50 AM Thread Starter
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Ah i get it, thanks. I gave my stocking list once and people said it "looks more like the stocking list for a 20 gallon", so not heavily stocked in fish but i do like a good amount of plants.
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post #4 of 5 Old 01-29-2010, 02:53 AM
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Light stocking and lots of plants? You should be fine with just the one canister, then.

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post #5 of 5 Old 01-29-2010, 06:38 PM
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I just answered this in a similar post. I'd go with the 2217 model. That's what I use in my 55gal planted tank. I joined this forum when I was researching this same topic. I went with the 2217 based on this post: Does this make sense to anyone with a Eheim canister filter?
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