What size surface cleaner

I have a 4gpm 3500 psi
Belt drive pressure washer.

What size surface cleaner will work the best?

Sent from my iPhone using Pressure Washing Resource

We used a Whisper Wash Classic with 4 gpm back in the day.

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16", no larger than 18" for efficiency.

I’ve seen guys say the rule of thumb is 4 inches for every gpm you have.
So, according to that, 16 inches.
I have an 18 inch with 2 spray tips and a 24 inch with 3.
I do have to walk a little slower with the 24 inch, but those extra 6 inches seem to make them clean at about the same pace

I have a 4gpm 4KPSI and I run a 28" surface cleaner and it work’s great for me.

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