Hi, I'm Mike and a new member. I live in Colorado and since I now live in an apt. and don't have flower gardens anymore, I've satisfied the gardening bug with orchids. I have about 30, mostly Cattleyas and Phalaenopis. I use rainwater to water them, but several of my 5 gal. buckets have developed algae in them. Is it OK to still water with this? If not, can it be cleansed by bleach or Physan 20 or such? Thanks!