I've got an aquarium bubbler ( ok it's my minnow bucket airator but who's counting lol) going in 5 gals right now. If it's dissolved CO2 like the state of NH and Vt say then it should raise the pH (supposedly???) I'll find out tomorrow hahahahaI use the General Hydro pH up and down. A little goes a long way. I also use salt nutients so i typically have to adjust pH anyways. You can use lemon juice if you want a natural addative. Another thing I noticed with rain water is it takes the pH meter a lot longer to settle on a number and it seams like the pH changes depending on the time of year.
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