Those specifications are much worse than 30 year old PUR-06. It makes one liter per hour with 20 Watts and fits in your pocket.
I tried solar panel and windshield wiper motor. But direct-drive windmill was much better as wind blows 24/7 on Baja.
https://youtu.be/9xYXWISWv5I?t=390
Durability was the issue. I destroyed three units and average was 200 days / 1000 liters, because all-plastic construction. Found no limits on filter durability.
I was planning to make those crucial breaking parts from Carbon Fiber myself, but I was such a poster-boy for PUR that they sended me free PUR-35 ($5000). It makes 3 liters per hour and if you replace the solid-iron pumping shaft it weighs about a kilo.
Except one crucial high-pressure valve cannot be made of plastic. I made better one from fiber glass. Thereafter it been running ok for 20 years.
I tried solar panel and windshield wiper motor. But direct-drive windmill was much better as wind blows 24/7 on Baja. https://youtu.be/9xYXWISWv5I?t=390
Durability was the issue. I destroyed three units and average was 200 days / 1000 liters, because all-plastic construction. Found no limits on filter durability.