Nope, haven't tried.
I haven't really dared, my buckets are white and tend to produce quite a bit of algae. I don't have any fertilizer on hand but I think you can test that by letting the water with the fertilizer in it get wicked over into another empty bucket and see if it's the same colour or som fertilizer gets filtered away.
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Thank you for your comments, I appreciate them! :)Suggestions are also welcomed!
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