I use Botanicare products as well but I use the prob-bloom and Hydroplex....i'm not too familiar the "plant power" line. dustko is correct imo...you need Cal-Mag if you use RO water. Cal Mag puts back all the good things your RO system takes out of your water (calcium, minerals, etc) so you can not only spend money to take everything out of your water but also spend money to put things back in.

Cal Mag is a biggie. :thumbsup: