They make fresh water out os salty. Ever dreamed of getting one - since have learned about them on Timo Noko's website. Price is deadly - 600 $ for small PUR-06 (the one that Timo used in Baja) and 1400 for bigger PUR-35. It's a manual pump (version Power PUR35 is same 35-pump with 12-volt motor) + tricky membrane. Sometimes people sell them on-line for funny prices like 200 $ for P-35, but...
1) No history of quality, especially for more popular with boaters PUR35 - either "reliable like a brick", or "poor maintenance records". Frequent use may irreparably wear the membrane in one year, and oil-contaminated coastal waters - even faster. On the other side, it is recommended to be flushed with biocide (bacteria killer) if not used 4-5 days, and manuals warn against inactivity period longer than a year (since the first use).
2) No idea how expensive, if ever possible, is to restore membrane (other parts are valves, rings and steel body, as I can understand). Online "Sailorman" shop occasionally sells restored ones (after marine troops, I guess) for 70% of price - I'm not sure what really they "restore".
Sorry for long message, but will appreciate any sharing of experience. You know - thousand of bucks is smthng to think about :-).
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- Any opinion on desalinators (watermakers) PUR06, P