Nah, still doesn't make any sense either way. Watts is a measure of power, not energy. The amount of power (given they use a pump and electrodialysis) shouldn'

Nah, still doesn't make any sense either way. Watts is a measure of power, not energy. The amount of power (given they use a pump and electrodialysis) shouldn't depend on the volume. Energy OTOH does. So either their device requires 20W of power - which sounds reasonable as the image shows a <100Wp solar panel next to it - and the volume figure is meaningless. Or the author left out crucial context (e.g. is the power draw correlated with the speed, i.e. 20W @ 0.3l/h). The amount of energy would be 67Wh/l regardless given those numbers. It's just a confused mix of performance (processed volume per hour) and power requirements (which is independent of volume and should only depend on the performance).