I have one of these, and I've found that the
ocean runner pump that they bundle it with is a little too powerful. I removed the water adjustment knobs, and it still overflowed the collection cup within minutes. The best solution I've found is to get a good quality air valve, something that will allow some fine adjustment. Place that on the air intake and use it to limit the air flow into the skimmer until the foam reaches the bottom of the collection cup. After the skimmer breaks in some, you should be able to open the air intake a little more.