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Thirdly, a ph of 7.2 really isn't that much to worry about but you'll need to monitor and check your irrigation water which could well be the source of it. It's worth allowing water to stand for 24 hours so some of the elements it contains can evaporate before watering your plants with it.
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Yea dude, 7.2 isn't something to worry about in a soil grow. 8.0+ or 6.2- would be something to worry about. Just use some ph down from the pet store. Shits cheap, don't worry about using lime. You can be more accurate with the ph down from the pet store.