Why don't we sell laundry sheets or pods? I know they're convenient, but the binding agent, PVA or polyvinyl alcohol, is a synthetic polymer. It is essentially a soluble plastic, that seems to at least partially biodegrade, but the bottom line is that there isn't enough research at this point to fully understand what exactly happens to PVA in our wastewater, or the long-term environmental impact of PVA.

I know it's less convenient, but until there is more data, please consider using powder or liquid detergent.