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How to lower ph and make it higher

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i've heard of lemon juice being used to lower it as ph down is pretty strong, not sure about raising it. best to just get some ph up and down though it's not expensive compared to anything else you need to be successful. 


Should work, dunno how much you'd need though. 


With PH down, there seems to be 2 main types, I think the one I use is phosphoric (not too sure about that without going for a look at the bottle), and the other is citric acid based.  The one I use is stronger and seems to be more stable in my experience, but if you're doing aquaponics you need to use the citric as it's gentle on the fishies, which incidentally is what I put on my fish in the form of above mentioned lemon juice, num nums.

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