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Slow-release prevents initial growth spurts in plants. It also ensures that the fertilizer works over a longer period of time, reducing the number of fertilizer applications required in a year. SoundGRO does not need to be watered in.
Metals like lead and arsenic may pose a risk to human health if concentration levels are too high. The EPA and WSDA have adopted strict content standards for these metals in biosolids fertilizer. SoundGro meets these standards.