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Post Info TOPIC: delavan 5850


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Date: Mar 12, 2011
delavan 5850
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hey everybody,just wondering if this pump i ordered is a good choice,and whats the differance between the delavan bypass pump and a demand type pump? smilei ordered the demand type and hope it was the right one.

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dave davis


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Date: Mar 12, 2011
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 Welcome Dave. I'm not to sure, but I think you picked the right one.

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Date: Mar 12, 2011
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yeah me too.im new at the business but have been roofing most of my life,would like some feedback from you pro's

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dave davis


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Date: Mar 12, 2011
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Demand pumps are controlled by a built in pressure sensing demand switch. These pumps require a balanced flow, too small of a nozzle may restrict the flow, resulting in the Demand Pump shutting off. Bypass Pumps can be used in applications which would result in frequent stopping and starting of the motor. Pump models with an internal bypass are designed to pump at a higher pressure with low flow rates.



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Date: Mar 12, 2011
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So Joe,do you think i made the right choice in buying the demand type pump?

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dave davis


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Date: Mar 12, 2011
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mrgreenclean wrote:

So Joe,do you think i made the right choice in buying the demand type pump?


You picked the correct one do you know if the 5850 is a 3 or 5 gallon per minute pump?


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Premium Member Roof Cleaning Institute of America Certified Roof Cleaning Specialist

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Date: Mar 12, 2011
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I think you got the right one, my choice would be the 5850 5gpm

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Joe Botti

412-477-5431 / 412-477-5064

Pittsburgh, PA

Roof Cleaning Pittsburgh, Greensburg, Monroeville PA

Pressure Washing Pittsburgh, Greensburg,Monroeville PA



Premium Member Roof Cleaning Institute Of America Certified Roof Cleaning Specialist

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Date: Mar 12, 2011
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on demand is best, 2nd most is viton seals. Equally important. Alot of this you cand find in search. Then there is GPM. There all about the same, 60 psi.

GPM. This is where it can get tricky. It's all in what you are used too and can afford waste. Over spray etc.

Do some searching on that!

Welcome to the RCIA!

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Our own Scott Davis from Confident Roof Cleaning in Houston Texas is reporting great results with the new Flo Jet Pentaflex!

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Certified Cedar Shake Roof Cleaning Specialist

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Date: Mar 12, 2011
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I have the internal bypass one also haven't used them yet, suppose the help with restriction. I am going to use the fatboy starting this season on my big rig. Have done fine with the 5850. The 5 GPM is best, though the 2 will work okay.



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Date: Mar 13, 2011
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I use the fat boy, love this pump, it takes a bit to get use to over the 5850 5gpm though, that fat boy brings a bit more chemical out the nozzle. took a job or two to not waste some chemical. I have both pumps on my truck at all times. remember to flush them clean after each job.

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Date: Mar 13, 2011
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Thanks everyone,yeah i got the 5 gpm pump,all need to do when it arrives is set it up and test its performance on my oun house before putting it in service with customers.Thank you .

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dave davis


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Date: Mar 13, 2011
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Welcome to the RCIA Dave.


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