When creating a hydroponic garden, just like with any other environment for that matter, it is very important to be constantly aware of the pH levels inside your water tank and around the roots. This can be done in several ways, with two kinds of measuring tools and with a lot of checks before, right after and long after you’ve inserted the fertilizers and supplements into your “soil”.
This is why many distributors of hydroponic nutrients supply a variety of products that either lower or elevate the pH levels in the hydroponic system. To be able to keep track of everything, almost constant attention is necessary. Once the pH gets over 6 (the number varies depending on the plant and its age), there is the chance to use the pH level lowering products and vice versa. This makes hydroponic growing a full-time job and sometimes even more.
– See more at: http://www.rosebudmag.com/growers/hydroponic-tips-ideas/gardening/ph-importance-on-hydroponic-gardens#sthash.p7AZmESj.dpuf