what sealer should I use: or should I use any ?

what sealer should I use: or should I use any ? Images

what sealer should I use: or should I use any ?

what sealer should I use: or should I use any ? Description

The entire surround of my house is in sand (http://maplered.com) Stone (http://g603.net) - need I say more !!!  I find the best way to clean it is with a karcher water blaster and (http://maplered.com) it works excellent BUT, there is always a BUT isn't there ? what sealer should I use: or should I use any ? should I just continue using the karcher water blaster abut 3 times per year - it takes about 4 days to do all !!! I am concerend that the sand (http://maplered.com) sone may detiorate with constant use of the water blaster but I do like that rugged look when it has been cleaned instead of the "oh so clean and (http://maplered.com) unatural look"
 
 
Many thanks for any suggestions.
 
cheers
 
John