Can someone explain the difference between a flow test and a hydro test on a fire hydrant. I have a customer who asked to have the hydrants tested at a site, and looking back thru records I found that a company did flow testing for 8 hydrants for $225.00 each and the year before at the same site a company did hydro testing for $375.00 for all eight. Also, is the difference in this testing in NFPA 25, and is it required annually, or at all?
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