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RATE OF FLOW: Quantity of water flowing past a designated point within a specified time period, measured in gallons per minute (gpm). REAGENT: The chemical indicators used in testing water balance. (All the little bottles or tablets in your test kit). RE-BAR: Reinforcement bar, used to add strength to a concrete. After excavation of an in ground pool, a steel cage is formed out of re-bar, and the gunite shell is shot over and surrounding it. RESIDUAL: Usually refers to free available chlorine levels remaining in the pool after initial treatment or activity with contaminants. RESTRICTED FLOW: The term used to describe a condition preventing full flow of water. Restriction can occur with full skimmer or strainer baskets, obstructions in the plumbing, dirty filter, undersized plumbing or equipment , or placing devices like, heaters, cleaners or fountains in the circulation system. Restriction on the suction side creates higher vacuum, (or suction) while on the pressure side creates higher pressure.
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