Crispi, I'm using diatomite its cheaper than hydroton and it is also reusable. I ph my water before I add my nutrients, just throw the powder in the water. My tap is around 8.5 so 1/4 teaspoon is about right to drop it to 5.5 - 6.0. And so far the ph in my res has not needed to be adjusted and because of the plants size I am only changing the res solution every 10 days today is day ten so hopefully I'll have some new pics up tonight also. Thanks for stopping in as always your opinion means a lot to me.:thumbsup: