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Originally Posted by Ne0.
the nutrients you use must be pretty acidic, when you say PH down, is that an actual product you use to drop PH, concurrently is there a PH up if your water starts at an initially lower PH level and you are using acidic nutrients such as yourself?
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Yes, there is a product called PH Down- there is also a product called PH Up.
Both can be found at your local grow shops. In a pinch, I've heard that you can use PH down/up that was designed for aquarium use. I have no idea if the products have the same active ingredients. Since I buy my nutes at the grow shop, I just picked up some PH down while I was there.
I don't know what you will be using for nutes but I use the basic General Hydroponics nutes. As mentioned previously, I haven't a clue whether all brands of nutes will have a similar reaction to PH.
Here's a pic of the GH brand PH down for reference: