The advantage of the wavebox is the push pull action of the device (like real ocean surge). With a closed loop you are just adding flow, unless you go with somekind of flow device to alternate the return flow.
they are 2 different things.. not to be compared... the wavebox is a rocking motion but does not push water.. a closed loop moves water.. the wavebox compliments a tank but can not be used as the sole method of water movement..
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