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Old 04-21-2008, 11:49 AM   #1
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Fluval 304

I'm expecting to recieve a fluval 304 today and wanted to hear any and all opinions about the filter.

First: I got it for $55 shipped on craigslist, he said it comes with everythign but the manual and is a year old. Good price?

The man I am buying it from changed the output head to a spraybar, so I may spend $2-3 to get the original output nozzle back on it.

I planned on hooking up my CO2 reactor into the downflow, but it had occurred to me:

Can't I just make a hole and silicone the checkvalve right into the Fluval's downflow, and use the filter itself as the reactor? Is the PVC reactor even necessary? Or even better: run the CO2 tubing into the tank, and just have the bubbles release right into the intake filter. THis way they'll have the entire length of the hose to fight the current and dissolve mostley(completely?) before they even get to the cannister??

Generally, please tell me about this filter, its pros/cons, what to look out for or beware of, and how I should inject my CO2 into it, or hook my reactor into it.
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Old 04-21-2008, 12:37 PM   #2
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Before I got my Fluval FX5, I did research on that series of filters too. That is a good price for that filter, as long as it's not too old and is still in good condition. New, that thing runs about $150.
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Old 04-21-2008, 12:38 PM   #3
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I have one on my SW tank. I took out the foam to keep my nitrAtes down, but for planted I think you folks like nitrAtes. The only issue I have with mine, is it's hard to open. The 05 series seems to have improved on the design. Other than that, is is a great filter. I just wanted to chime in, sorry I couldn't help with your specific application.
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Old 04-21-2008, 01:41 PM   #4
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I have a 404 that has been running flawlessly for 3.5 years. It is quiet and effective.
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Old 04-21-2008, 01:54 PM   #5
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Thanks for the info everyone. I've heard that some ceramic center piece can break easily, so to be careful with that. Anyone have any experience with this?

Any info on injecting CO2 into it?
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Old 04-22-2008, 11:35 AM   #6
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Well it arrived yesteday and I'm fairly disappointed b/c I got what I paid for. I was hoping to get way more than I paid for but no luck.

First of all the listing said it was a year old, and it appears MUCH older than that (constructed in 2004) and it has some scuffs on the outside.

THe seller didn't clean it, at all, so it stunk fairly bad when it arrived. I got it all cleaned out and it's looking and working okay.

The seller told me it came with everything except the original output nozzle which is MOSTLY true. It was missing the 90 degree elbow clamps, all the suction cups for holding the tubes in place, and some of the tubing but that is about it.

I noticed when I turn it on it is kind of noisy, like a soft rattleing. Does this happen with your FLUVAL's too?

Is there anythign special I should do to the media besides thoroughly rinsing it, since it was previously used for a SW tank and I'm using it for a FW tank?

I'm still waiting on info about injectign the CO2 directly into the intake tube, is this okay to do?
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Old 04-22-2008, 11:44 AM   #7
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I can't speak to the fluvals, as I use renas, but don't reuse the old media. Get new media and start clean.

As for injecting, you can inject directly into the intake, but it'll be noisy, as you'll hear the impeller chewing up the bubbles. I recommend a reactor. DIY, pretty simple with basic PVC knowledge, and less than $20 to build.

Sparky has built several and did an awesome write-up on a how-to. Check it out here
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Old 04-22-2008, 11:47 AM   #8
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I would buy new media, but that's just me. The idea of using someone else's old slimy stuff, especially when it's from a SW tank, kinda scares me. If it was me, I would just get new media, and seed it from what you have now.
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Old 04-22-2008, 12:17 PM   #9
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Exactly the answers I was looking for, thank you!
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Old 04-22-2008, 12:22 PM   #10
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I would also check the impeller for wear, that may be where your noise is coming from.
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