pressure washer: rate of dilution

Do any pressure washers have anything other than just one rate of dilution (i.e. rates different from standard rate for cleaning liquid)? If so, what brands?
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Frank Thompson wrote:

Don't know. But can't you adjust the dilution manually by diluting the cleaning liquid?
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HeyBub wrote:

Many models have adjustable chemical injectors and there are add on adjustable chemical injectors. Look at the northerntool site, they have a wide array of pressure washers and components.
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On Thu, 9 Apr 2009 02:50:05 -0700 (PDT), Frank Thompson

I believe some models are adjustable but a common fixed ratio is 7:1
Use this calculator for higher ratios. http://jansson.us/mixingratio-concentration.html
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