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raise ph
I'm using RO water in my soil grow gang and its coming outta my filter at about 4.0-4.1 according to my ph meter,and its calibrated with 7.0 control solution.so its dead on and I need to raise my ph for sure.I've been buying ph up at the pet store but its tough to find and aint cheap.is there anything around the house I can use .I've heard baking soda,but it adds to the hardness of the water also.help I'm out of ph up
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