Kind of an odd question - approximately how many full pumps are required on a nicely maintained B&G 1 gallon stainless steel sprayer? The label on Masterline Bifenthrin 7.9 states it should be used indoors at or under 25 p.s.i., and I kind of feel like buying and using a pressure gauge for such a basic task is unreasonable. I have been under the impression that, in general, a surface area sprayed with a finer mist would allow the area to be more evenly treated, whether it's carpet, tile, or something else. I know there are some cases where some of the spray actually bounces off (as I've learned in reading about flea broadcast sprays), but do you know why the 25 psi thing was mentioned? Also, would you recommend a very high (but reasonable and safe) pressure be used on outside band sprays? Another question about application rates on granular products. If a label states 8 oz per 100 sq feet, is the easiest way to apply it to measure 8 oz of the product, place it in a little shaker, and try to place that pre-measured amount reasonably evenly throughout the 100 sq feet?
These are REALLY important questions, so I'll go on for awhile. First on the sprayer, and the nozzle tips on hand sprayers may be one of the most overlooked items in our tool box. They get clogged and worn as time goes on and eventually the spray volume and pattern that you THINK are coming out of them no longer are. I once had a technician complaining that the flea product he used was no good and was simply not controlling fleas. So, I watched him apply it one time and realized that instead of the even fan pattern he "thought" was being applied to the carpet, his clogged and worn spray tip was putting out two widely spaced pin streams. Probably 95% of the carpet wasn't even being treated because he failed to check his equipment and to test it now and then to be certain it was in good working condition.
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Please note, Mr. Pest Control is answering questions supplied by PMP customers across North America. His answers are generated from industry and manufacturer-provided information. The answer may not be specific to the laws and regulations for your State, Province, Territory or Country. In addition, products mentioned may not be registered and or available in all areas. Always check with your local Univar office for specific information to your area. Always read and follow label directions.