Posted: Fri Jan 19, 2007 9:12 pm
If used without malfuction, then xP filters are very silent in their operation. The only noise that may occur is the water being sprayed out of the output, but that is easily countered by submerging the output into the water. The sound it emits is nearly unnoticable, you can really only hear it soundly if you're a foot away from the filter.
xP filters (depending on model) cost 50-200ish USD. Most people here use the xP3, one of the higher rated filters in this line of filters, and it costs anywhere from 100-170 USD. However the recently released top model the xP4 is also out, and it's in the market of 165-220 USD. I personally don't recommend the xP1 or xP2, they may be cheaper at first, but they won't be handle large enclosures or large turtles as well and you may end up upgrading again. Also the xP1 and xP2's suggested tank capacity is comparable to a good hang-on filter, which is more compact, and sometimes cheaper.
One last point of advice, if you didn't know, it is strongly recommended you buy a filter for your turtles rated 3x your tank, since they crap a lot more and it's way bigger than fish waste (which is where the filters are rated for on the box).
Hey hey hey.