According to Danner the differences between the PondMaster and the MagDrive is the PondMaster has stainless steel screws instead of steel or plastic, an 18' cord instead of 6' and a 3/4" barbed intake molded into the head rather than a 1/2" NPT female fitting and a filter.
I've never seen anything listed about EMI or a weight differance, and the head plates are exchangable.
Very interesting though (and could make sense). Fish likely wouldn't enjoy EMI either (especially tropical), but I can't back this up.
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Danger Den Maze II
Danner Mag Drive 350
Heater Core Style Rad
Thunderbird 1400 (Soon Barton)
512mb PC2700 CL2
Promise SX4000 Raid 5 w/256mb PC133 Cache
4x40gb Western Digital 7200hdd
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