i just aquired a military surplus pur 35, (now katadyn 35), manual watermaker. 1.3 gal/min hand cranked. seems to work quite well. my concerns are: i am hopefully gong to coastal sail the tex gulf coast, where the water isn't the clearest, in a year. i singlehand so don't see any problem keeping up with 1-2 gal day for minimal use. in your oppinion is this a suitable system for a small coastal boat, 1 person? how clean does the water have to be to start with? and, what contengencies should i make....parts kits, filters, membrane, etc?thanks,william