If you have one laying around,then I think it is a cheap upgrade with impressive results.I actually bought a maxi jet 1200 and an eco mod upgrade and am happy with the results{for the price}It is not as good as my Seio1100 or my Koralia4 IMO.
I disagree. I replaced my Koralia 4 with a Mj600 and the SureFlow kit. I think the difference is quite noticeable. Besides, the Koralia 4 is 1200 gph @ 8.5w and the Mj600 is 1400 gph @ 7.5w.... The Mj's with the sure flow only get stronger while you've reached the top of the line on the Koralia's. That is why I chose the Mj's.
Oh yeah, the Seio is 1100 gph @ 21w. ...and they are huge!!
The EcoMod is quieter than the SureFlow, but the Sure Slow has a ball socket attachment like the Koralias. The MJ mods definitely beef up small powerheads but do work slighly different than the Koralias. I use them all.
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