PCBs limit how much water goes to unregulated drippers (drippers with no set flow rate). If using an Angled Drip Stake or Blue Fast Flow Drip Stake in a DIY system with a high-pressure pump (like the Professional AQ7000 25mm Pump), they’re a must! Fix the PCB to your dripper with a small section of delivery pipe.
Note: PCBs will not work with smaller pumps than the AQ7000 as they do not create enough pressure.
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