Wayne G.

Thx. for the info guys. I am losing about 500 psi with 100' of 3/8" and according to the Gates Hose Online fluid flow calculator that is about right.

Searched the forums and cant find any posts on this. When I wash flat surfaces I am at 8gpm and 3500 psi with cold water when using 100 ft. of 3/8" ID 4000psi typical high pressure hose. I want to go to 100 ft. of 1/2" ID hose to reduce pressure/flow loss. 1/2" ID 4000 psi sewer jetting hose is cheaper and lighter than the corresponding typical high pressure hose.... Any recommendations?

On occasions when I am running 8 or 9 gpm and 3500psi with spikes higher than that when the gun is closed. I am having a big problem finding a two way 3/8” carbon steel ball valve that can handle that. I have some 6000 PSI Alco PB3NS-LS which are OK but they are $100/ea and I have to order two at a time.I use Parker valves for my lower pressure apps with good success. However, their valve with these specs is no good. Does anybody know of anyone else who makes a good 5000-6000 psi valve?

Need feedback on the brand itself and specifically the RKV5G40 direct drive (5gpm @ 4000psi)

I have an 8gpm/3000psi setup with a Steel Eagle surface cleaner for cleaning flat surfaces. Have tried many different ball valves and the best one I have found (Parker v-500hp-6) rated for 6000psi does not leak, but becomes very hard to turn after a few jobs. I do not ever "throttle" this valve... it is either wide open or closed. Anybody have suggestions on a better ball valve for this application.

Thanks guys - I do not use a specialty chemical to clean gutters. Any recommendations? I have heard that Simple Green works but in some cases has done damage... is this the case?

Any ideas on how to remove this black stain on stucco/dryvit from asphalt shingles when you can not get up close to it with a wand?

MMI - Have not seen check valves for sale by themselves at Delco. I bought some additional check valves at the local Parker Store (Parker-Hannafin Corp)

MMI - The co is Delco Cleaning Systems. There website is dcs1.com. Download their Wats Blaster Catalog and the Power Booster is on page 21 in the top right hand corner.

MMI - I bought something called a Power Booster from a pw distributor. It combines the water flow from both my cold water portables. Works great! If you think this would help you and it is not against site rules to post info on distributors and there catalog items then I will be glad to give info on it.

Beth - Thanks for your input. I use 3% bleach and laundry detergent downstreamed at about 8 to 1 to clean houses. And I'm pretty sure this will not help. Any house wash detergent suggestions?

MMI - I have noticed a difference in cleaning at 3600psi vs.3300psi and thought the step from 3700 psi to 4000psi might result in the same difference.

Thanks MMI!

MMI - thanks for the info. I am currently cleaning a 36,000 sq ft parking lot so a turbo is unrealistic. And 95% of my work is residential, so I can not justify nor do I have the money for a hot water unit. My setup is two cold water units plumbed together so I have 9 gpm and 3600psi at the pumps

Ken I am cleaning very dirty aggregate with cold water and no chems.