<a href=showthread.php?s=&postid=8913386#post8913386 target=_blank>Originally posted</a> by Pomacanthus Rex
did the same, went with an or2500. almost half the price of the eheim and with the correct 3/4 fitting (for my plumbing).
i was expecting some noise but it is very quiet. not as quiet as my eheim 1250, which is all but silent. the or has a bit of a hum to it but it is far better than the sedra 3500 that is driving the rs80 skimmer.
by the way, the eheim is much smaller than the ocean runner, from just eyeing it seems about half, just in case size is an issue. also, the eheims are warrantied for 2 years with the or just one.