How do I know what size water pump I need I’d like to add one
You want to be more specific?
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Are you trying to replace your PWing pump? Do you want a pump to feed from your buffer to your PWer? 
Required HP = (gpm x psi) ÷ 1100
Equation is reversible to solve for psi or gpm…
That machine is no bigger than 4 gpm.
