Algae all over the place

[Yéri]

Hi Guys,

Our 4 months old greenhouse is have its first issue so far: algae!

We keep our seedlings wrapped in sphagnum moss in trays and most of them have a brown layer of algae on top.

Rather than spray Physan 20 (which I read might be harmful to seedlings), I bought Agralan Citrox in order to contain the damage. Seems to have stalled it for a bit, but I'd like to avoid any future outbreaks.

As the algae seem to be developing in our water reservoir inside the greenhouse, which sits on a heated floor, I'd like to neutralize the algae between that reservoir and the watering hose.

The water is smelly as well when it comes our of the hose, so plenty of bacteria as well in there I suppose.

After consulting a few websites, my best guess would be to install the following: Mauk 601 Kombifilter UV-C Netz-/Aktivkohlefilter, 7 W: Amazon.de: Garten

This would (or should) eliminate any algae or bacteria going through the filter. Unfortunately, I don't see anyone having tried this with watering orchids. I have a PP filter like this installed for the automatic misting system in the greenhouse, and that water seems to be devoid of any odours, so that seems to work just fine.

Might there be a downside to using this when watering our orchids?

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