Pool Free-Chlorine Dose by Product
Free-chlorine dose = ppm x (gal/1e6) x 8.34 lb, divided by the product available-chlorine fraction, as dry oz or (liquid) fl oz. A 15,000 gal pool +2 ppm needs 6.2 oz of 65% cal-hypo, or 25.6 fl oz of 12.5% liquid. The product label governs.
Formula and source
lb_cl = ppm x (gallons/1e6) x 8.34; lb_prod = lb_cl / (avail/100); dry_oz = lb_prod x 16; liq_floz = (lb_prod/10) x 128.
The standard pool free-chlorine dose mass balance and product available-chlorine fractions, by name.
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