steve8855

Typically lower water would not cause overflow, just the opposite. Could be a lot of stuff in the water column? Something die?

skimmers can take up to 3 weeks to "break in" so that they can be dialed in correctly and not overflow. I had a very similar issue with a hang on back skimmer that if it over flowed it would cause a big issue with salt water on my hard wood floors. What I did to resolve the issue is I took some electrical tape and covered all the holes on top of the skimmer's collection cup which causes bubbles to not build up into skimmate in most skimmers. Take a thumb tack and poke holes one by one into the electrical tape (you may find that you only have to put tape over some holes instead of all of them) right over the covered holes and slowly over the next few weeks you will have to make the holes bigger or remove some of the tape so that the water rises more until eventually after the skimmer is broken in a little more you can remove the tape all together.

What brand of skimmer?Don't block the air, as the less air it gets, the more water injects into the body. Full open air, and open the outlet as far as possible to lower the water level in the body of the skimmer.

This situation can also result after using products like Chemi-Clean.