Posted: Sat Dec 23, 2006 6:25 pm
I don't know about long-term reliability, I've only had my xP4 running for a little over one week right now, but so far, it is doing a fine job keeping the water clear and odourless. My tank is too small for my four turtles (all mature, 7-11 inches each in a 90G, will upgrade when I find the space and money), but considering how much waste and skin shedding four turtles does in one day (I didn't have the filter running for the 1st week, had to do daily water changes), it really works.
With the xP4, I only need to do a water change every 1-3 weeks (I assume, since the water is still clean right now). The fourth media basket is a good thing (I put in more Chem and BioMedia), allows for more complete filtration, and is easy to set up. I've never owned another Rena xP filter before, but I assume that it is also quiet and efficient as its predecessors. However, it still retains the trouble of putting the tubing on as the earlier models, I ended up greasing my tubes to get them to fit. Unless this is standard in all xP filters, the 1st day, it will be slightly noisy, since it doesn't fully pump out all the air in the filter (the little air bubbles in between baskets and such), but after that, it's as silent as a mouse.
But if your funds are good, I'd recommend getting two xP3 filters instead, since dual filtration is better than one, six media baskets (3 from each xP3), plus you can have an intake and output on each side of the tank, meaning faster, even better filtration as compared to having one intake on one side, and one output on the other.
I also had the opportunity to purchase an FX5, but I declined for the xP4, since for one thing, it's cheaper, not to mention hearing that Rena has an easy maintenance quality product, compared to Fluval Filters, which are more prone to breakage (even the new "improved" models), and their replacement parts are semi-hard to find. I also prefer the transparent canister of the xP, you can see what's going on, with the FX5, you can't see immediately if there's a problem going on. Then again, the FX5 looks unique compared to previous Fluval models, so it might have a new way of filtration, but I'd stick to Rena if I don't have the time to test and return if I find a problem.
Eheim is the best brand of filtration there is, high quality, but is also very expensive (Up here, the top model cost 3x that of my xP4, and I think it only has 3 media baskets, correct me if I'm wrong).
Hey hey hey.