| Many nurseries think that Physan (which is a contact algaecide) is not any better then Hydrogen peroxide. They will work the same. I know one nursery that uses Physan weekly in the greenhouse. For him it stops all algae and greatly slows the decomposition of bark in his mixes. Either should work fine for your problem.
Cynthia's suggestion of a spray bottom is the easiest application.
Keep in mind that Hydrogen peroxide breaks down when exposed to air and has a limited shelf life, fortunately it is cheap.
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jerry  |