I assumed that BK's are recirc style skimmers when I asked how it's being fed.
Traditionally, skimmer pumps are both the driver behind drawing water into the skimmer and the driver behind pumping air and shredding the air bubbles inside of the skimmer.
A recirculating skimmer uses the pump to simply do the air part - ie. the pump intake draws water from the skimmer body itself. This theoretically increases contact time. But it means that the skimmer itself needs to be fed water by some other means - either gravity or separate feed pump.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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