When using a standard 16 ounce two reel developing tank, Kodak's method of running water used with HCA, requires a minimum flow rate of .2 gallons per minute, using a total volume of 1.125 gallons after 5 minutes. The alternative of 10 fill and dumps uses 1.25 gallons. Ilford's method uses a volume of .375 gallons, but assumes a non-hardening fixer. Kodak assumes a hardening fixer and would require less washing than their published data if adjusted for a non-hardening one, especially if still used in conjunction with HCA.