Using Physan 20

[Pilot]

Hi All--

All of my phals are in S/H and as such, their pots are pretty full of algae-- vibrant green, but something I don't much care for because I can't see the roots in action.

So I bought Physan 20. I followed the directions but it didn't do anything right off. Is it safe to assume the algae has been "hit" and will die off in the coming days?

Also, because Physan is a chemical designed to kill off things, I thoroughly drenched the pots with clean fresh water, followed by my weak fert.

After applying physan, should one flush the pot or let the physan remain? I know some of the physan will be left behind simply because the hydroton likely kept some behind but I don't want to hurt my orchids and am a bit unnerved with this stuff.

Any advice on what you do would be great-- thanks.