My tap water is all over the place - ranging from a pH of 7 to 9+. I'm using AN Sensei in Lightmix, and Lightmix + coir(40%). I've had loads of issues but now I know about my tap water my plants are much better. As I use a lot of water ( but not so much I have run off ), can I store ph'd water for a few days? What's the best general pH down? I've been using calmag ( not good apparently), molasses, lemon juice, and malt vinegar. Got some citric acid in the post and a cheap pH pen which my pal's going to calibrate for me - (I tried,failed.) Here's a pic of my grow - this is bigger and more buddy than my other attempts - what is the best way to deal with fluctuating source water PH issues? Thanks.