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Protein Skimmer keeps overflowing

Like the title says, my skimmer has been up and running for months, but in the last couple weeks every other day or so it starts to overflow.

It's gotten to the point where I'm afraid to have the skimate(sp) iild up in the collection cup and i have had it turned down for a couple days now. I'm no expert but I'm sure when it overflows and dumps all that waste back into the tank it's bad for everything in the tank!

Anyway its and eshops 150 and it's in a constant 9 inches of water in the sump. I haven't had any weird or wild water level swings in there so I'm just not sure what's going on.
 
If its mechanical, it's usually one of two things, either the air is being blocked by something, or the water discharge is being impeded by something. When was the last time you had it out for a good cleaning?
 
If its mechanical, it's usually one of two things, either the air is being blocked by something, or the water discharge is being impeded by something. When was the last time you had it out for a good cleaning?

I second this. I had the same problem with my SWC 160. Chased it for weeks. Finally I decided to pull the air line and low and behold there was a bit of salt creep impeding just enough to cause a problem. Couldn't see it until I pulled the airline off though and regular cleanings wouldn't get to that spot.
 
i had the same thing happen to me. Took apart the air intake attached to the pump and it was clogged with calcium build up. I actually had to thread a screw threw it in order to clear it. Fixed the problem though.
 
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