be careful when using bottled water see where it is being derived from. if it isnt put through reverse oasmosis it is the same water u get out your sink maybe even less purified. Plus its expensive most grocery stores and all walmarts have a reverse oasmosis filling staion for $.35 a gallon. that way you control whats in your water. It has a ppm of 128 and ph of 7. all water should be 7 ph not 5.5. After you add you nutes ph naturally drops perfectly to 6.5 if using organic nutes. you can almost judge the amount of nutes in your water by your ph. if you put too much nutes in your water your ph is going to be low.