I bought a dozen of these to use with various chemicals. They have so many flaws. The general design is good but don’t ever drop them as the sprayer head is super delicate and even the most minor fall will render them useless. After a while, even respecting the PH limits, the dual spray action stops working and only works in the usual one pump action. By far the worst attribute is how they just stop spraying. I’ve tried cleaning them and making sure there were no clogs and still. You will know you’re in trouble when it becomes harder to pump and the spray pattern becomes fine. Shortly thereafter, it will completely stop pumping fluid. Can’t believe Ehsun’s sells these. You’re better off with a Zep sprayer from Home Depot for $5
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