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People often ask me "Chris, what is the best brand of air pump".

Honestly, I have used Yamada, Versa Matic, Wilden, and ARO, and saw  little "difference" between brands.

Jim Wilden invented the air pump many years ago, his patents expired, and he got copied, just like competitors copy us.

An air pump is a quite simple device, and as long as the diapraghm matierial are chemically resistant (Santoprene, Teflon) and the pump body (Kynar, Polyproplyne) you are good to go 

All Flow Pumps do have a longer warranty, I am told. 

The Polyproplyne/Santroprene pump Gary just bought SHOULD be rinsed out after use. This is because SOME Polyproplyne is fiberglass filled, in an attempt to make it stronger.

I have a 1/2 inch Wilden with santoprene diapraghms that we used for nearly a year with NO Rinsing. This is because the Wilden Poly Pumps are unique in that they use no fiberglass filling in their poly bodies to make them stronger.

Instead, Wilden uses pure virgin Poly for their poly pump body that is insanely thick 

A 1/2 inch Wilden Poly Pump makes a 1/2 inch Yamada or All Flow Poly Pump look like a Toy by comparison.

A Poly Pump is OK, but if it is not Virgin Poly, and fiberglass filled, it must be rinsed, or the fumes from the roof cleaning chemicals will attack the fiberglass, and weaken the pump body, over time.

We used a 1/2 inch Yamada Poly Pump for nearly 6 months with NO Rinsing, because I like to torture pumps 

It did last 6 months, then leaked all over. It is NOT rebuildable anymore, because it's body has been compromised.

The 1/2 Wilden Poly was never rinsed, it made it 11 months, it's diapraghms simply wore out. Some new diapraghms, and it is good to go. It sits still broken, in my garage, never to be used by us again. 

We have switched to 1 inch air pumps because quite simply, they are better.

They have less pulsing, shoot better, spray faster, and last longer.  A 1 inch air pump, with a compressor of 13 hp or more is the best roof cleaning pump system I know of, within reason.

We use a Wilden 1 inch air pump made out of a special metal called Hastelloy. It has Teflon Diapraghms. I would have preferred Santoprene, but it is what it is.

I bought it used off Ebay for around 400.00 (it sells new for nearly 3000.00)

It just sits there and works, cleaning tile roofs every day, 6 days a week, big ones too. I have had it over a year, and it was used when I bought it 

It is capable of nearly 49 GPM flow, so it is LOAFING at the flow requirements for roof cleaning.

LOL, it sounds like it is "Farting" as it runs. 

Because the diapraghms in the larger 1 inch pumps move less for a given flow, they last longer.

A 1/2 inch pump goes whoop whoop whoop whoop as it works, the 1 inch pumps just "Fart" every 20 seconds or so, depending on nozzle size.

I look at pumps like brand new pick up trucks. What is a "better truck", Ford, Chevvy, or Dodge ?

I say the one you can get the best deal on, because they are all good.

Just be sure the materials the roof cleaning pump is made from are compatable, and you are good to go.