The ph of the tap is around 7.0. The ph of the RO is 6.0. The tap water is high in calcium according to the deposits it leaves on faucets. I'm not sure what else is in there though. Its municipal water for what thats worth. I used 1 drop of the superthrive and 1 teaspoon of B1. The canna nutrients I used 4ml/gal. I've only used the canna nutrients once and now both plants are drooping. Getting the water/nutrient mix down is going to be a bigger pain then I had though. One of the seedlings is starting to twist a little. you can see it in one of the pictures. I'm getting The RO water from a machine. I can't afford my own right now so I'd like to be able to use the tap/RO water if it will work. I will cease using the superthrive/B1. Thanks for taking the time to help Stinky, your the best . These seedlings have just reached the 2 week old mark.