Cleaning Chemical Application

Lastly the homeowner can find out the little tricks on the cleaning trade that the qualified power washing contractors have been applying for many years to make their operate appear much better, go more quickly and be far more cost effective.

The application of chemicals is among the longest standing controversies in the power washing industry. You will find just as several opinions on the correct process of undertaking so as there are chemical applicators. The 1 issue most contractors seem to agree on is the fact that no single process will serve all circumstances efficiently. Of each of the distinctive solutions, the three most frequently employed are 1) down stream injection [after the pump], web site  2) chemical before the pump [through the pump], three) along with the chemical applicator pumps.

Every single of these techniques has their advantages also as their limitations. Down stream chemical injection is most often made use of on cold stress washers because of low price along with the ability to turn the chemical on and off in the wand. Chemical injection just before the pump is most frequently used on hot stress washers because of the capability to apply chemical compounds with hot water, which tends to make them much more efficient. And chemical application pumps are made use of exactly where the chemical substances are not compatible together with the stress washer.

The down stream injector will be the most common towards the power wash sector. They're coupled in-line and operate on waterpower. The water velocity is what creates the necessary vacuum (venturi) to draw the chemical and mix it with all the water flow. Altering the size in the discharge orifice regulates the water velocity. This really is most normally achieved utilizing a roll over valve, a double nozzle head (see web page 4), or possibly a dual lance wand (see web page 12). Most manufacturers of those injectors claim that their draw prices are from 10% to 20%. Using a couple of exceptions, I've discovered this accurate. The issue with this really is that many individuals are requesting a draw rate in excess of 50%, that is only obtainable with an injector which is specifically created to match in the finish of a spray lance (see web page 13). The troubles with this injector are price and as a result of the place, it is a cumbersome package to manage for some applications. The contractors who most generally request greater draw rates are ones who're applying chlorine to exterior surfaces such as buildings, decks, and fences. The reason for their concern is the fact that the strongest concentrate of sodium hypochlorite (chlorine) obtainable is 15%. When this is mixed at a 10% to 20% ratio within the injector, quite a few people really feel that it truly is too weak to adequately clean and take away mildew. From this springs a further query, the advisability of applying chlorine as a cleaning agent to begin with. We could pursue this to infinity and never attain a consensus.

Yet another difficulty with this kind of injector is resulting from the restriction created inside the ¼" pressure hose which is employed as an integral component of a telescoping wand. A down stream injector will not work in most circumstances with a ¼" pressure hose. That is due to the fact the ¼" hose creates also significantly restriction and reduces the water flow (increases the back pressure) causing the injector to not operate.

Other issues that could inhibit the flow of water, thereby decreasing velocity and stopping the vacuum that may be needed to draw chemical, are: 1) discharge hose in lengths of 200 feet or more, 2) installing the injector prior to the hose reel, water heater, or other restrictive devices, 3) and applying specific types of trigger guns which can be as well restrictive.

One particular advantage of downstream injection is that you may use significantly less chemical. On the downside you will clean slower mainly because you will be applying the chemical under low pressure and rinsing on higher pressure. With up stream injection before the pump you might apply your soap as you happen to be washing on high stress and rinse on high stress as well. You'll use additional chemical this way but you are going to clean more rapidly and more thoroughly. Also down stream injector permits the operator to turn the chemical draw on and off from the gun whereas upstream chemical injection [before the pump] calls for that the operator return for the machine to turn the chemical on and off. As you may see down stream chemical injection can save lots of measures along with a large amount of time more than the course of a day. One more main advantage down stream chemical application more than just before the pump injection is that you'll be able to use chemical substances which might be corrosive in nature (like acids) because they never ever enter the pump, unloader valve, or heater coils.

Upstream chemical injection is performed by restricting the inlet water for the pump. High-pressure pumps utilized on hot high-pressure washers can pull a vacuum. Therefore, these pumps don't have to be stress fed and they have the capability to draw water and chemical substances from water tanks and chemical tanks. The vacuum is designed with a restrictor barb or gate valves within the inlet plumbing towards the pump. The operator has to return towards the pressure washer to turn the chemical on and off using a metering valve. These units possess the benefit in any strength of chemical could be mixed using the inlet water. Nevertheless, the chemical (normally a heavy duty alkaline detergent) ought to be compatible using the elements inside a pressure washer. Most top quality high-pressure washer detergents are compatible with all the internal components of a stress washer (instance: R-109 or DNB-1430.

When taking into consideration the collection of injectors it is vital for you to understand how they function and to figure out their worth for your style of cleaning. It really is a well-established truth that chemical is less costly than labor and that the best approach to assure return company is always to do the most beneficial job that we can.