One most common reported problem with the 2d system was " loss prime" once air is sucked into the delivery line. The pump will run contiuously to regain pressure but the trapped air has no where to go until the next opening of the HSV valve.
When you plan your system, try putting some baffle into the water tank or have a small accumultor tank just below the main tank.
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Richard L
aquamist technical support
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