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> Any suggestions on size, GPM, pump manufacturers, HP, etc.  Any
> features that I would want, don't want etc.
Get a special nozzle, sometimes called a 'turbo nozzle'. It has a  
spinning nozzle inside it so the spray comes out in a cone pattern.  
It allows you to clean a larger surface with each pass. It does a  
much more uniform job of cleaning slime, etc, off a surface.
As a side suggestion, try using some moss remover on the deck first,  
but only if there's no grass adjacent to the deck. The rinse runoff  
stunted my grass for a while.
- Bill Rabel
   Anacortes, WA
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