Home / Resources & Training / Tips of the Trade / Don't Lose Valuable Abrasive Don't Lose Valuable Abrasive Posted in Abrasive & Water Blasting Tip: #14 Setting your valve to optimum setting Once your blaster is running and the dead-man trigger is on, look at the abrasive flow coming out of your nozzle. An efficient air/abrasive mixture will be only slightly visible, appearing as a colored haze in the air stream. If you see a lot of color in the air flow, there’s too much abrasive (and not enough air) in the mixture. Why? Your abrasive metering valve is open too far. When this happens, your cleaning efficiency is lowered, valuable abrasive is wasted and you’re losing money. To get the perfect mix: Wind the metering valve in to the fully closed position, Now slowly open up the metering valve, until you can only just start to see the color change in the air exiting the nozzle. That’s all the abrasive you need for fast and effective blasting. Note Garnet Users: When working with Premium Garnet abrasive and a Thompson Valve, 4 turns out from the fully closed position generally gives a perfect flow rate. Tip: #14 SHARE OR SAVE THIS PAGE https://www.blastone.com/resources-training/tips-of-the-trade/dont-lose-valuable-abrasive Copied link to clipboard Download Related Links > Metering > Abrasive Media > Number of Turns Required for Optimum Efficiency on a Thompson Valve > How Long Should My Blast Pot Last between Refills?