yes it is and i love it.....i just lost my 3 big koi though about 2 weeks ago and they were about 12 inches long i still don't know why...it was after a big rain and they had no apparent outward trauma on them so i don't know...they were in the pond since they were about 3 inches...i have alot of other fish but i guess i will start again wiuth the koi...lorraine