Hello,
A mag 18 is just fine on a single beckett.
They require only about 1200 gph with a pressure rated pump to operate normally.
If the water hieght in your reaction chamber is higher than the beckett assembly, that is why it is spitting..for instance, if you were to shut the skimmer pump off and the skimmer output off....and filled the reaction chamber with water to its normal operating height....where does the water even out on the beckett side ?
It is a design flaw im sure, but should be easily fixed.
Marc.
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