ALIEN Hydroponics RDWC 22 Pot 2 Row 36L Compact Header Kit with Air Pump Aeromixer make them at ½% to
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ALIEN Hydroponics RDWC 22 Pot 2 Row 36L Compact Header Kit with Air Pump Aeromixer make them at ½% to make them at ½% to 3% and monitor them yearly Max abnormal pressure 3600 PSIG