Dropped after nutrients
That’s good to know. Last grow I switched from happy frog to NFTG and had a very nice result.
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It should be worked into the soil, and once it is in contact with the soil moisture, it will begin to breakdown. Watering after incorporating into the soil will speed the process.
I recommend Espoma Organic Garden Lime.
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Dolomite lime You can scratch it in an water. You will not see a change overnight will take a little time. Also good practice to verify ph meter in a fresh clean bottle of 7 PH solution .
Good luck 
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This can also be an early sign of nutrient build up in the soil. I depends on how much and how long they were used. An indication this is the case is if ph has dropped over time while runoff ppm has increased. In this case the corrective action is usually to flush the medium to reset its ph.
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I thought Advanced Nutrients are supposed To eliminate the need to adjust pH 
@Dexterado Happy Cannaversary
How much water should be flushed thru 10 gallon fabric pot?
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How much water should be flushed thru 10 gallon fabric pot?
30 gallons to flush a 10 gallon vessel or close. I would check the run off numbers a third of the way through the flush 
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Water with a ph a lil high like 7 see what happens are u showing lock out soil is a buffer 5.8 to 6.5
Dont add lime, ff soil bucfered… something isnt right here…
Is that a pen or probe? Show us a picture please.
One for soil and one for run off