I need more power (at the washdown)

[autumnbreeze27]

I've got a washdown pump that is a Shurflo Blaster, 45 PSI 3.5 GPM.

I've got two spare water pumps. One is another blaster, the other is a shurflo 4 GPM 55 PSI.

Would it help if I put the second blaster in series or parallel? or would I be better off swapping it out for the 4gpm model?

[a64pilot]

I believe a second pump in series will do it, unless the volume your using is too much, then you would need a bigger pump or put them in parallel.
Maybe buy a cheap pressure washer?

What I am saying is I don't think they are a 45 PSI pump at 3.5 GPM, I think the 3.5 GPM comes at a much lower PSI