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Improved paddle life on all Digi-Flo  paddlewheel flowmeters. After months of testing different material combinations and mating  part tolerances, we've been able to drastically improve our paddle  and axle life over 200% (in some cases up to 400%).   The best part is, you can upgrade your existing Digi-Flo flowmeter  without changing the K-factor. Just replace your existing paddle and  axle with the new set, and your done. See How to replace the paddle / axle. Whenever the paddle or the axle needs replacing,  Blue-White highly recommends you replace both. The data collected over the past five years indicates that  most paddle wear is caused in applications using DI (Deionized) water. DI water  is known for being an aggressive fluid, sometimes called "hungry  water." This test was conducted at our factory using DI water  (conductivity of 5 micromhos).  We maintained a DI water flow velocity that exceeded 25 feet per  second! The test ran 24 hours  per day 7 days per week.   Wetted  materials: Axle = PVDF  (Kynar) Paddle = PVDF  (Kynar) Body  / Fitting = PVDF or Polysulfone or PVC or Stainless  Steel                                (depending on selected pipe fitting) O-ring = Viton or EP   (Viton is standard) Upgrade your Digi-Flo Now.