Yeah - I dont think I would mess with that when It comes to my plants. I did use the lemon juice - I just squeezed some into my water, the problem is, its a quick fix, not a permanent fix. The PH in the water/plant needs to be fixed for good.

I found a package of PH up and PH down at my hydroponic store and it came with a ph tester for only $15 - its enough supply for personal growers, and I dont forsee having to purchase more for at least a year.

I also bought some PH strips and they gave me a second opinion of accuracy, and they work Great! They were only $6. I cant invest in a high quality $90 PH right now, maybe later.