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I'm not sure I understand what you mean by turn each on/off...
do you mean soemthing like solonoids/timers? If so, I would not advise it: overthought, unecessarily complex, and delivers less overall water flow than full-time converging effluents that produce random turbulent flow (the term is real my friend, if it matters to you... do consult oceanographic lit/refs, etc.)
Anthony
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"If you give a man a fish, he eats for a day... but if you teach a man to fish, he eats for a lifetime."
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