Mag 9 return - two dead in three months, why?

jimrawr

New member
So I set up my sump in February. Since then I have had two mag drive 9.5's stop working on me. They both lasted around a month and a half or so. Both of them were brand new. The first one stopped working and when I opened it up was extremely clean with no build up on it. I had it replaced by warranty, but still had to buy another to use in the meantime. My second one died on my in the middle of the night last night, and when I open this one it had a bit of build up on it, but not too crazy. I took a picture so you guys could see. Once I cleaned it a bit it started right up again.

Whats causing these pumps to die so fast on me? Is it possible with a ball valve that I have it dialed back too far that the pressure is destroying the pumps? I have the ball valve around 50% closed.

Here is the impeller after I started to clean it a bit.

photo-8.jpg


Jim
 

tmc1313

New member
Is the ball valve before or after the intake? It should not be before or it will shorten the life of the pump. You said that after cleaning the 2nd pump it started back up. Is there some sand getting sucked up and jamming the impellar?
 

jimrawr

New member
The ball valve is after the intake connected to the return line. I dont think there is any sand but I recently did a complete rock swap so there was a lot of debri floating around in the tank, total cloudiness. A lot of that has settled into the sump now.
 

lostanime

New member
Are you dosing kalk etc near the pump intake?? Strainer on pump intake clogged/restricting flow?

I ran multiple mag12s for years without even cleaning them... Never gave me any trouble (outside of heat, danner/supreme makes some of the hottest temperature pumps I've ever used)
 

jimrawr

New member
I dont dose kalk, just two part, and neither are dosed near the return pump. I do have a sponge on the inlet of the pump to prevent microbubbles
 

FishinMich

New member
If your trying to reduce flow from the pump to the display replace the valve with a tee and then put the valve on the tee. open as far as needed to bleed off the some of the flow. I prefer gate valves for this.
 

jimrawr

New member
Intersting never thought of that. Not sure that having a ball valve is the problem though, isn't running a valve pretty standard on these??
 

Useful_Idiot

Artificially Intelligent
fluval canister filters have a valve built in to slow and stop flow but the directions say you can't set it lower than 50%. I believe the motor will over heat if there's not enough flow around the magnet/impellar to cool it. the tee is a great idea. chances you got two bad pumps are slim.
 

jmoney

New member
That's weird.

I've got a Mag 9.5 running since 2005 and I've never cleaned it.

same here, I have never touched it, only turned it off maybe 5-6 times, are you running your pump through a gfi strip?, take that foam cover off the front too, I had a mag 5 that always had problems with that thing on
 

sjm817

On Yer left!
Premium Member
I'm not a big fan of running too big a pump and throttling it way back or wasting electricity by bypassing flow back to the sump. A ball valve is fine for fine tuning but not major adjustments. Hard to say if the large reduction in flow is causing the pump to fail from the reduction in cooling flow. If you have to cut the flow back by 1/2 and dont have a use for the excess flow, maybe its time to try a different pump.
 

sjm817

On Yer left!
Premium Member
Do yourself a favor and get an Eheim 1260. Quiet, plenty of flow and what should interest you, very reliable. People have had these pumps running for many years.
 

zigzag1

New member
I find if I keep Ca targeted at 420ppm and not much higher, it tends to reduce precipitation on heaters and pump impellers. Also, precipitation increases with temperature which tends to cause build up in these areas. A more efficient (cooler running) pump may be just the ticket. GL!
 

Dr. Reef

Dr. Reef at ur service
RC Sponsor
strange. i got 6 mags from 9.5 to 18 running for 5 yrs now. some dialed down halfway. never cleaned them either.
 

shifty51008

12-5 Chiefs record
thats what I thought, my mag 9.5 has been running also for 5+ years turned half way down and only cleaned once when I was in between tanks.
 
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