于 2003-04-06 23:17 i use the recommended pump 1200L/H to run the skimmer for 4 days, during this period, i observed that the gas bubble is not enough , so , you can see there are not much dirty thing come out from the skimmer. i think if we use a pump about 1800L/H~2000L/H to run this skimmer may have a better result.