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need help with ph please :-)

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I tested my water after letting it sit for 48 hours and it was at 8.1. My water straight from the tap was at 7.5. I then tested my nutrient solution at that came back at 7.3. After giving it to my plants the runoff was at 6.6. Why is it i see people ph'ing down to 6.5 before feeding there plants??
 
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