hey. easy way to bring down ph and hold it there if your water is very hard(=high ph), is to use the brita water pitchers. when you fill pitcher, pour it into plastic gallon jugs to store. brita(and similiar pitcher filtration devices) remove alot of the carbonates that will cause your ph to be high+ purify your water in general. this makes a great water for your plants similiar to r/o water, just not as completely deionized.