| Finally the homeowner can learn the
| |
| | is what creates the needed vacuum
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| little tricks of the cleaning trade that
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| | (venturi) to draw the chemical and mix it
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| the professional power washing
| |
| | with the water flow. Changing the size of
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| contractors have been using for years to
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| | the discharge orifice regulates the water
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| make their work look better, go faster
| |
| | velocity. This is most often accomplished
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| and be more cost efficient.The
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| | using a roll over valve, a double nozzle
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| application of chemicals is one of the
| |
| | head (see page 4), or a dual lance wand
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| longest standing controversies in the
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| | (see page 12). Most manufacturers of
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| power washing industry. There are just as
| |
| | these injectors claim that their draw
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| many opinions on the correct method of
| |
| | rates are from 10% to 20%. With a few
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| doing so as there are chemical
| |
| | exceptions, I have found this accurate.
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| applicators. The one thing most
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| | The problem with this is that many people
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| contractors seem to agree on is that no
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| | are requesting a draw rate in excess of
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| single method will serve all
| |
| | 50%, which is only available with an
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| circumstances efficiently. Of all the
| |
| | injector that is especially designed to
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| different methods, the three most often
| |
| | fit at the end of a spray lance (see page
|
| used are 1) down stream injection [after
| |
| | 13). The problems with this injector are
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| the pump], 2) chemical before the pump
| |
| | cost and due to the location, it's a
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| [through the pump], 3) and the chemical
| |
| | cumbersome package to handle for some
|
| applicator pumps.Each of these methods
| |
| | applications. The contractors who most
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| has their benefits as well as their
| |
| | commonly request higher draw rates are
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| limitations. Down stream chemical
| |
| | ones who are applying chlorine to
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| injection is most often used on cold
| |
| | exterior surfaces such as buildings,
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| pressure washers because of low cost and
| |
| | decks, and fences. The reason for their
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| the ability to turn the chemical on and
| |
| | concern is that the strongest concentrate
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| off at the wand. Chemical injection
| |
| | of sodium hypochlorite (chlorine)
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| before the pump is most often used on hot
| |
| | available is 15%. When this is mixed at a
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| pressure washers because of the ability
| |
| | 10% to 20% ratio in the injector, many
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| to apply chemicals with hot water, which
| |
| | people feel that it is too weak to
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| makes them more effective. And chemical
| |
| | adequately clean and remove mildew. From
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| application pumps are used where the
| |
| | this springs another question, the
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| chemicals are not compatible with the
| |
| | advisability of using chlorine as a
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| pressure washer.The down stream injector
| |
| | cleaning agent to begin with. We could
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| is the most common to the power wash
| |
| | pursue this to infinity and never reach a
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| industry. They are coupled in-line and
| |
| | consensus.
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| operate on waterpower. The water velocity
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| |
|
