Modern backpack sprayer products are highly versatile, and if properly tweaked, can be successfully used for a wide variety of uses in and outside of the home. In order to get the most benefit from your sprayer, it is necessary to double check that you are applying the proper recommended calibration techniques.
Before discussing anything in detail, the first thing to check is your pressure. Many people assume that the pressure is going to be constant, but this is not necessarily the case. Some models of sprayer will have a small pressure gauge and dial somewhere on the tank which will need to be checked and adjusted. Other, usually more expensive, models will have a pressure valve built in which removes the need for this. The idea is to maintain a constant pressure between 15 and 20 psi.
If you plan to use your Backpack Sprayer for the application of a number of products, hopefully you have purchased one which is capable of accepting different sized nozzles. You may want to apply minimal pesticides for example, but more volume when watering. As there are a number of different sprayers available, it is advisable that you purchase a variety of nozzles when you purchase your sprayer, to ensure that they fit and are for the purposes that you desire.
Nozzles are composed of four components: spray tip, screen, cap and body. It is these first two components which require deep consideration to perfect your spraying technique. The screen is the filter that prevents the tip from clogging. The finer the tip, the finer the mesh needs to be. The tip is the part which controls droplet size and spray pattern. You may want a fine mist spray, a horizontal line of spray or an adjustable cone. Tungsten carbide is the most resilient nozzle tip material, with brass being the most inappropriate. There are a number of simple equations that spray staff members will offer that can deliver a good estimate of the best spray nozzle combination. Remember that factors such as walking speed and height from the ground will all impact the exact solution.
Once you believe you have achieved the desired spray pattern and pressure, spray a patch of dry pavement and examine the result. Check for uniformity and adjust accordingly until you achieve the perfect result. These testing steps may take some extra time, but in the long run they will save you time and frustration in having to go back over certain areas, or seeing crops struggling despite being sprayed. One common mistake made by sprayers is that they forget to mark their starting point, leading to either spraying the same spot twice or forgetting a whole strip.
The best tips for even spraying once your system is suitably calibrated include keeping records and regular cleaning. Clogged nozzles can interfere with the spray pattern, and the worst part is that problems are often not noticed until later, and so there is no way of knowing which plants have been affected and which have not. Of course, cleaning the inside of the tank is especially critical if you are using the same tank for insecticides and pesticides.
The correct combination of the three factors of walking speed, pressure and nozzle tip will ensure that you get the ideal results every time. Consult a catalogue which will offer you ballpark estimates of the type of nozzle you should be looking for, and then visit online or in store to speak about specifics. Contact Green Gorilla for advice on their premium range of auto-pressurised backpack sprayers and nozzles.