I recently had to replace the impeller on my sedra 5000, but had it for 5 years. (mine has the needle wheel for skimmer).
I've heard that many other people have had to replace these impellers after relatively short lives because they swell with corrosion between the impeller magnet and the casing.
They may have rectified the problem by now.
My Mak 4 has been running for 4 1/2 years pushing water up 6 feet. Great pump for the price. 1200gph. around $220 i think
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90gal Starfire mixed reef, 400W MH (Giesemann 13K megachrome/Icecap E-ballast), (2) 54W T5 Giesemann true actinic, 45gal sump (65W 50/50 PC), ASM G-3 Skimmer, Mak 4 return, Sequence Dart closed loop, foam backdrop, 120 lbs LR, 2" sandbed, & 1 dillhole running the show.
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