If cost is a concern and you still want to get the benefits of kelp, you can also just take about a bucket's worth of washed seaweed (free), add dechlorinated water, a little sugar, and then just let it sit, and sit, and sit.
Mine's been going for about 5 mos and it works just fine.
Stir if you like, but it's not necessary. The smell gets sublime. Dilute it 1:10 (drench) or 1:20 (Foliar spray). They will stand at attention quick!
I use it mostly for my alfalfa/worm/kelp tea.
And I agree with MissS, taste is where one can detect it. Then again, that's the most subjective part. Who knows.
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