I was looking into portable desalination hand pumps. and I found this one one Amazon for $959 it says
the Katadyn Survivor 06 is the world's smallest hand-operated desalinator and can easily fit into an emergency kit. It removes bacteria, viruses and other contaminants, and can make 1 ounce of drinking water in less than two minutes (nearly 2 pints per hour) with an average pump rate of 40 strokes per minute. This compact, lightweight unit is designed for one to two person use in liferafts or a ditch bag. It's a trusted device used by the US Navy, US Coast Guard, US Air Force and is essential equipment for any offshore cruising vessel.
In separate area it says
enough for a life raft with up to 1-6 people
Probably great for the first day or two, but I would expect that filter has finite amount of sea water it can filter. The Amazon page does not say anything about filter lift nor offer options to purchase replacement filters.
The device mentioned was the top hit on my google search, this question is about desalination filters in general, not this specific example in particular.
How much sea water will I be able to desalination with a portable pump before it stops working?